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Characterization and influence of shear flow on the surface resistivity and mixing condition on the dispersion quality of multi-walled carbon nanotube/polycarbonate nanocomposites
Young Sil Lee, Kwan Han Yoon 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.2 3 86-92 (7 pages)
capillary and injection molding. Shear induced orientation of MWCNT was observed via scanning electron microscopy, in the direction of fow in a PC matrix during the extrusion process. The surface resistivity rose with increasing shear rate, because of the breakdown of the network junctions between MWCNTs. For real applications such as injection molding and the extrusion process, the amount of... mixing to investigate the effect of the shear rate on the surface resistivity of the nanocomposites. In this study, an experiment was carried out to observe the shear induced orientation of the MWCNT in the polymer matrix using a very simple melt flow indexer with various loads. The compression-molded, should be eliminated. MWCNT/PC nanocomposite sample exhibited lower percolation thresholds (at 0.8 vol%) and higher electrical conductivity values than those of samples extruded by capillary and... -
The Deposition and Characteristics of Ni Thin Films according to Annealing Conditions for the Application of Thermal Flow Sensors
Noh. Sang-Soo, Lee. Eung-Ahn, Lee. Sung-Il, Jang. Wen-Teng 한국전기전자재료학회 Transactions on electrical and electronic materials 5 Pages
한국전기전자재료학회 Transactions on electrical and electronic materials 2007, Vol.8 No.4 161-165 (5 pages)
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Injury and inflammation detection by the application of microcurrent through the skin
Timothy Hui-Jerrold Petrofsky 물리치료재활과학회 Physical Therapy Rehabilitation Science 8 Pages
물리치료재활과학회 Physical Therapy Rehabilitation Science 2013, 제 2권 제 1호 6 31-38 (8 pages)
been shown in extracellular inflammation, with high Cohen’s kappa agreement between impedance and the in- flammation in rhinitis and asthma [16]. Significant differ- ences in impedance and specific resistivity have also been shown in myocardium damaged by ischemia, with increased impedance and resistivity (resistance per unit volume) in is- chemic myocardium [17]. Urinary bladders with carcino... tissues. Design: Case control study. Methods: First, microcurrent was measured as decreased blood flow induced hypoxia in healthy subjects. Next, reliability was assessed by measuring over ten days with set variations in pressure and distance between the electrodes. Finally, measurements over sprained ankle were compared to measurements over comparable uninjured areas on the same injured subject. Results: For the blood flow test phase, microcurrent significantly decreased an average of 17% after... -
Pulsed-wave Doppler ultrasonographic evaluation of hepatic vein in dogs with tricuspid regurgitation
Jaehwan Kim, Soyoung Kim, Kidong Eom 대한수의학회 Journal of Veterinary Science 7 Pages
대한수의학회 Journal of Veterinary Science 2017, 제 18권 제 1호 10 73-79 (7 pages)
on blood flow parameters including velocity, resistivity, and direction [10,16]. A previous study showed that accurate interpretation of the hepatic vein (HV) waveform detected with pulsed-wave (PW) Doppler ultrasonography is clinically valuable, as it is greatly influenced by both cardiac and hepatic factors [22]. Several studies have evaluated the normal HV pattern by applying PW Doppler... This study was performed to identify the relationships between hepatic vein (HV) measurements, including flow velocity and waveform, using pulsed-wave (PW) Doppler ultrasonography, and the severity of tricuspid regurgitation (TR) in dogs. The study included 22 dogs with TR and 7 healthy dogs. The TR group was subdivided into 3 groups according to TR jet profile obtained by echocardiography. The hepatic venous waveform was obtained and classified into 3 types. A variety of HV measurements,... -
Simultaneous Determination of Various Macrolides by Liquid Chromatography/Mass Spectrometry
Youn-Hwan Hwang, Jong-Hwan Lim, Byung-Kwon Park and Hyo-In Yun 대한수의학회 Journal of Veterinary Science 6 Pages
대한수의학회 Journal of Veterinary Science 2002, 제 3권 제 2호 7 103-108 (6 pages)
month under this condition. Deionized or distilled water of 18.2 ㏁ cm-1 resistivity was used throughout the experiment. 2-2 Instrumentation and chromatographic conditions Samples were analyzed by a Hewlett-Packard 1100 series LC/MSD system. It consisted of a G1322A degasser, a G1312A binary pump,a G1315A photo-diode-array detector, a 59987Aelectrospray interface and a 5989Bmass spectrometer. The... Macrolides are frequently used in veterinary medicine as therapeutic and preventive agents for various diseases. It is difficult to determine macrolides simultaneously with conventional methods due to their similar structures. A simultaneous analysis for erythromycin, roxithromycin, tiamulin and tylosin with LC/MS has been developed. Separation was performed on C18 reversed phase column. Mobile phase was gradiently flowed with 10 mM ammonium acetate and methanol. The mass spectrometer was run in... -
Distinct Cellular Calcium Metabolism in Radiation-sensitive RKO Human Colorectal Cancer Cells
YunTaiKim, SooShinJo, YoungJunPark, MyungZaLee, ChangKookSuh 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 8 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2014, Vol.18 No.6 10 509-516 (8 pages)
possi- ble mechanisms for radiation resistivity of A549 cells. These observations are well supported by other reports stating that Ca 2＋ released from the reduction in ER is not sufficient to produce apoptosis [10,24]. Not surprisingly, it was found that the activity of Ca 2＋ transporters of A549 cells investigated in this study was not as much affected by γ-irradiation as that of radio-... Radiation therapy for variety of human solid tumors utilizes mechanism of cell death after DNA damage caused by radiation. In response to DNA damage, cytochrome c was released from mitochondria by activation of pro-apoptotic Bcl-2 family proteins, and then elicits massive Ca2＋ release from the ER that lead to cell death. It was also suggested that irradiation may cause the deregulation of Ca2＋ homeostasis and trigger programmed cell death and regulate death specific enzymes. Thus, in this... -
Influence of Processing on Morphology, Electrical Conductivity and Flexural Properties of Exfoliated Graphite Nanoplatelets–Polyamide Nanocomposites
Wanjun Liu, Inhwan Do, Hiroyuki Fukushima , Lawrence T. Drza 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2010, Vol.11 No.4 1 279-284 (6 pages)
a given content of xGnP in the PA6 nanocomposite. The resistivity difference is directly related to the dispersion of xGnP-15 in the nanocomposite. The lower resistivity is due to the very good dispersion to form a conductive network along the melt flow direction, which is consistent with the result of the ESEM. Also, the CNR twin screw processed xGnP-15 PA6 nanocomposite possesses good electrical... -
Purification of Multi Walled Carbon Nanotubes (Mwcnts) Synthesized by Arc Discharge Set Up
Y.Malathi, Balaji Padya, K.V.P.Prabhakar, P.K.Jain 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2010, Vol.11 No.3 3 184-191 (8 pages)
in the materials electrical resistivity [22]. Various methods have been reported, including chemical oxidation [23], thermal oxidation [24-26], filtration [27], and chromatography [28,29]. These processes are able to remove impurities to some extent, but not completely due to certain limitations. Therefore, various purification methods were tried out. Intercalating pristine carbon nanotubes and... -
Preparation of Boron Doped Fullerene Film by a Thermal Evaporation Technique using Argon Plasma Treatment and Its Electrochemical Application
Arenst Andreas Arie, Bup Ju Jeon, Joong Kee Lee 한국탄소학회 Carbon Letters 4 Pages
한국탄소학회 Carbon Letters 2010, Vol.11 No.2 9 127-130 (4 pages)
a band-gap of 1.5 eV and an electrical resistivity of 10 3-10 8 Ω·cm at room temperature. In order to improve the conductivity of C60 films, boron atoms can be introduced into the C60 lattices. The preparation of boron doped C60 films was firstly reported by Zou et al. [5,6], however no applications were proposed in their works. In this study, the boron doped C 60 films were prepared by the...