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Pal, K.,Rajasekar, R.,Kang, D.J.,Zhang, Z.X.,Pal, S.K.,Das, C.K.,Kim, J.K. Scientific and Technical Press ; Elsevier Science 2010 MATERIALS AND DESIGN Vol.31 No.3
The effect of fillers on morphology and wear characteristics are studied in butadiene rubber (PBR)/high styrene rubber (HSR)/natural rubber (NR) blends with different types of carbon black. SAF N110 with SRF N774 type of carbon black shows a significant effect on curing studies and mechanical properties by reacting at the interface between PBR, HSR and NR matrix. Blends containing the same carbon blacks show high abrasion resistant properties against Du-Pont abrader, DIN abrader and different mining rock surfaces and also is found to be the toughest rubber against all types of rock.
Effect of fillers on natural rubber/high styrene rubber blends with nano silica: Morphology and wear
Pal, K.,Rajasekar, R.,Kang, D.J.,Zhang, Z.X.,Pal, S.K.,Das, C.K.,Kim, J.K. Scientific and Technical Press ; Elsevier Science 2010 Materials & design Vol.31 No.2
The blends of high styrene rubber (HSR) and natural rubber (NR) with nano silica were prepared using a blending technique in presence of different types of carbon black. The effect of filler on morphological and wear characteristics was studied. ISAF (Intermediate Super Abrasion Furnace) type of carbon black have showed a significant effect on optimum cure time, cure rate index and mechanical properties by reacting at the interface between HSR and NR matrix. All the samples show only one melting peak on the DSC curve; this is attributed to the same backbone structure of the matrix and the carbon black reinforcement. The samples containing 30 wt.% of HSR with ISAF type of carbon black has shown maximum heat buildup, lower swelling and lower compression set value. Blends containing ISAF type of carbon black with 30 wt.% of HSR showed high abrasion resistant properties against Du-Pont abrader, DIN abrader and different mining rock surfaces and also is found to be the toughest rubber against all types of rock. Coal is main abrader against the rubber under this study.
Relationship between normal load and dynamic co-efficient of friction on rock-rubber wear mechanism
Pal, K.,Pal, S.K.,Das, C.K.,Kim, J.K. Scientific and Technical Press ; Elsevier Science 2010 MATERIALS AND DESIGN Vol.31 No.10
In this study, rubber compounds were produced in varying proportions of carboxylated acrylonitrile butadiene rubber (XNBR) and natural rubber (NR) and the parameters such as cure characteristics, wear behavior against various surfaces at different normal loads, and frictional works were tested. The tensile strength and dynamic co-efficient of friction of sample containing 80wt.% of XNBR was high compared to other samples by 2% and 10% respectively. The results of XNBR and NR vulcanizates under normal pressure ranging from 43 to 118kPa were reported. Based on these results the relationship between normal load and dynamic co-efficient of friction has been proposed. It was also observed that sample containing 80wt.% of XNBR exhibits lesser volume loss than compared to other samples.
Pal, K.,Rajasekar, R.,Kang, D.J.,Zhang, Z.X.,Pal, S.K.,Kim, J.K.,Das, C.K. Scientific and Technical Press ; Elsevier Science 2010 Materials & design Vol.31 No.1
The blends of high styrene rubber (HSR) and natural rubber (NR) with nitrile blended PVC (NVC) and nanosilica are prepared by using a blending technique in presence of different types of carbon black. The effect of filler on morphological and wear characteristics is studied. ISAF type of carbon black have showed a significant effect on optimum cure time, cure rate index and mechanical properties by reacting at the interface between NVC, HSR and NR matrix. All the samples show only one melting peak on the DSC curve; this is attributed to the same backbone structure of the matrix and the carbon black reinforcement. The samples containing 20wt.% of NVC with ISAF N234 type of carbon black has shown maximum heat buildup and lower compression set value. Blends containing ISAF type of carbon black with 20wt.% of NVC shows high abrasion resistant properties against Du-Pont abrader, DIN abrader and different mining rock surfaces and also is found to be the toughest rubber against all types of rock. Coal is identified the main abrader against the rubber blends under this study.
Pal, K.,Rajasekar, R.,Kang, D.J.,Zhang, Z.X.,Kim, J.K.,Das, C.K. Scientific and Technical Press ; Elsevier Science 2009 MATERIALS AND DESIGN Vol.30 No.10
Epoxidized natural rubber (ENR) and organoclay nanocomposites (Cloisite 20A) were prepared by solution mixing in this study. The obtained nanocomposites were incorporated in natural rubber (NR) and high styrene rubber (HSR) blends in presence of ISAF and SRF types of carbon black as reinforcing fillers. Morphology, curing characteristics, mechanical and thermal properties and wear characteristics of the nanocomposites against standard abrader and different mining rock surfaces were analyzed. The morphology of the ENR/nanoclay showed a highly intercalated structure. The nanocomposites containing SRF N774 type of carbon black has showed increase in cross-link density, maximum torque and cure rate index compared to ISAF N231 type of carbon black. The overall mechanical properties and thermal stability was higher for the nanocomposites containing SRF type of carbon blacks. The compounds containing EC in NR-HSR have higher barrier properties compared to without EC. EC with SRF N774 carbon black has showed minimum compression set value due to the increased formation of effective network chains due to higher reinforcing efficiency of the nanoclay in the rubber matrix. EC with SRF N774 type of carbon black showed high abrasion resistance property against Du-Pont abrader, DIN abrader and rock-rubber experimental study and also it has been found to be the toughest rubber compound against all types of rock under the present study. Concrete has been identified as the major abrader against the blends than other rock types.
놀이로서의 `은유`의 재발견 - `퍼소나(persona)의 역할`을 중심으로 -
백인덕 ( Palk In-deog ) 한국언어문화학회(구 한양어문학회) 2012 한국언어문화 Vol.0 No.47
Poem `play` in terms of access, the language itself is a kind of play utilizing metaphors from Languages through play at various levels, ranging from creativity in education is accessible. The base of the poet (旣 知) Use of the things unknown (未知) to visualize the world. The `metaphor` as the target of one point it was noted that refers to a different destination. In this paper, a poet who, what, and that is playing with the `play` aspect of the attention to certain characteristics were seen. For this first `peosona` and `metaphor` of the poetic phase has reviewed. In modern poetry `peosona` poetic unity and individuality in the work are revealed. However, the mode of reacting to stimuli differing by the presence instantaneous descent, has been shrinking. On the other hand, a "metaphor" a metaphor or a simile and a contrasting message that increases the effectiveness of the concept of rhetorical devices away from the increasingly can illuminate the target in a new relationship between the rise in the concept of cognitive tools, reveals a tendency to expand. Eventually, the reduced `peosona` an extended `metaphor` in the poet would be playing `play` aspect of that will. The `peosona` useless to the play over is releasing his own ontological characteristics. It can be classified into three different directions. Externalization, internalization, transcendence is a requirement in this direction at the same time the formation of peosonaui `self` is also a requirement. Eventually, poet in the `play` means of `be-self` characteristics for the trial-has. The significance of these studies` peosona the concept of `change and implicitly the difference between the characteristics of modern "self-becoming` desire analogy can be found in the fact that it reveals.
Multiple fragment answers in Korean
Bum-Sik Palk 경희대학교 언어정보연구소 2013 언어연구 Vol.30 No.3
There are two main approaches to fragments: the Ellipsis Approach (Morgan 1973, Merchant 2004, 2010) and the Direct Interpretation Approach (Yanofsky 1978, Stainton 1998, 2006, Barton and Progovac 2005). Examining fragment answers in Korean and proposing a generalization of them, this paper argues that the Direct Interpretation Approach fails to account for the wide range of data and suggests two possible directions toward an analysis. It is proposed that fragment answers involve both ellipsis and pro/cleft and that contrary to what the Direct Interpretation Approach assumes, fragment answers involve structure. The arguments come from various 'word order' effects of multiple fragments and island (in)sensitivity of fragment answers. (Dongguk University)
Suh, Jeong-Ihn,Palk, Bo-Hyun,Oh, Se-Zu,Suh, Jung-Hun,Cho, Key-Seung,Palk, Young-Ki Korean Society for Biochemistry and Molecular Biol 1995 Journal of biochemistry and molecular biology Vol.28 No.2
A nicotinic acetylcholine receptor (nAchR) isolated from the electric tissues of Torpedo californica has been reconstituted into a vesicle comprising a bifunctional azo-ligand (Bae 1) compound, and a liposome containing phospholipids and cholesterol (1 : 1, w/w). The liposome-mediated reconstituted receptor showed a concentration-dependent response to cholinergic drugs in a lithium ion flux assay. This liposome-mediated reconstituted nAchR was immobilized onto an electrode using various synthetic polymers which were tested for their response to the cholinergic ligands. The immobilized nAchR not only exhibited a linear response to a wide range of cholinergic ligand concentrations but also retained an operational stability which lasted for longer than 6 days. Thus, this result provides a basis for application of the immobilized nAchR-based biosensor in detecting cholinergic ligands in vitro.