18,150 research outputs found
Reducing seek time of tracking actuator with pulsed excitation in optical disk
No full text학위논문(석사) - 한국과학기술원 : 기계공학과, 1999.2, [ vii, 74 p. ]한국과학기술원 : 기계공학과
The effect of announcements on heterogeneous forward-looking behaviors fr a handheld video console game market
No full text전류 밀도 제어 기술을 사용한 전기 화학적 공정
No full textAn electrochemical process using current density controlling techniques is disclosed. In the electrochemical process of this invention, a carbon cathode rod activated with a negative voltage and an electrode activated with a positive voltage are sunk into an electrolyte contained in a container, and so the electrode is electrochemically etched while properly controlling both the metal ion dissolving rate and the metal ion diffusing rate of the electrode by controlling the amount of applied current to maintain the two rates at a desired balance. This process thus creates a diffusion effect thickening the tip of the cylindrical electrode, and compensates for a conventional geometric effect sharpening the tip of the electrode. Therefore, this process produces a precise product having a uniform diameter along its length. In the electrochemical process of this invention, the electrode is ultrasonically washed on its surface with both acetone and distilled water before the process so as to remove impurities from the surface of the electrode. In addition, the electrolyte is a potassium hydroxide solution having a molar density of 402dc#6 M
전기 화학 방전 가공 장치와 가공 방법
No full textAn electrochemical discharge machining method may include electrolytically machining a tool fed by a three-dimensional tool feeder which can accurately feed a tool in three dimensions. The electrolytic machining may be performed in a current controlled mode, during which a concentration and a height of an electrolyte may be regulated. Further, the method may include performing electrochemical discharge machining of the workpiece using the machined tool in a voltage controlled mode
Four and a half LIM protein 1C (FHL1C)
No full textFour-and-a-half LIM domain protein 1 isoform A (FHL1A) is predominantly expressed in skeletal and cardiac muscle. Mutations in the FHL1 gene are causative for several types of hereditary myopathies including X-linked myopathy with postural muscle atrophy (XMPMA). We here studied myoblasts from XMPMA patients. We found that functional FHL1A protein is completely absent in patient myoblasts. In parallel, expression of FHL1C is either unaffected or increased. Furthermore, a decreased proliferation rate of XMPMA myoblasts compared to controls was observed but an increased number of XMPMA myoblasts was found in the G(0)/G(1) phase. Furthermore, low expression of K(v1.5), a voltage-gated potassium channel known to alter myoblast proliferation during the G(1) phase and to control repolarization of action potential, was detected. In order to substantiate a possible relation between K(v1.5) and FHL1C, a pull-down assay was performed. A physical and direct interaction of both proteins was observed in vitro. In addition, confocal microscopy revealed substantial colocalization of FHL1C and K(v1.5) within atrial cells, supporting a possible interaction between both proteins in vivo. Two-electrode voltage clamp experiments demonstrated that coexpression of K(v1.5) with FHL1C in Xenopus laevis oocytes markedly reduced K(+) currents when compared to oocytes expressing K(v1.5) only. We here present the first evidence on a biological relevance of FHL1C
Biogeophysical feedback of phytoplankton on Arctic climate. Part II: Arctic warming amplified by interactive chlorophyll under greenhouse warming
No full textIt has been shown that the interaction between marine phytoplankton and climate systems may intensify Arctic warming in the future via shortwave heating associated with increased spring chlorophyll bloom. However, the changes of chlorophyll variability and its impact on the Arctic future climate are uncomprehended. Lim et al. (Clim Dyn. 10.1007/s00382-018-4450-6, 2018a) (Part I) suggested that two nonlinear rectifications of chlorophyll variability play cooling role in present-day climate. In this study, we suggest that the decreased interannual chlorophyll variability may amplify Arctic surface warming (+ 10% in both regions) and sea ice melting (- 13% and - 10%) in Kara-Barents Seas and East Siberian-Chukchi Seas in boreal winter, respectively. Projections of earth system models show a future decrease in chlorophyll both mean concentration and interannual variability via sea ice melting and intensified surface-water stratification in summer. We found that suggested two nonlinear processes in Part I will be reduced by about 31% and 20% in the future, respectively, because the sea ice and chlorophyll variabilities, which control the amplitudes of nonlinear rectifications, are projected to decrease in the future climate. The Arctic warming is consequently enhanced by the weakening of the cooling effects of the nonlinear rectifications. Thus, this additional biological warming will contribute to future Arctic warming. This study suggests that effects of the mean chlorophyll and its variability should be considered to the sensitivity of Arctic warming via biogeophysical feedback processes in future projections using earth system models.11Nsciescopu
Manipulation of levitated cell aggregates by high frequency acoustic trapping
No full textAcoustic tweezers can levitate and manipulate a single object or objects through air and water. Compared to other tweezer technologies: optical tweezers and magnetic tweezers, acoustic tweezers have a huge advantage on trapping larger objects and generating aggregates with strong trapping forces. Moreover, trapped samples are not required to be optically transparent or labeled with a magnetic bead. Recently, acoustic levitation technique appeared to be promising in targeted drug delivery in human body, thus many levitation methods using ultrasonic wave including standing wave and surface acoustic wave have been developed. The single beam acoustic trapping has a definitive advantage over other methods since it only employs a single transducer. In present study, we demonstrated that single beam acoustic tweezers (SBAT) can levitate red blood cells (RBCs) aggregation in three dimensions and successfully performed the manipulation of levitated cell aggregation. This study is a significant step forward in manipulation of cell aggregates using high frequency acoustic tweezers.1
An exact theory for force-extension relation of stiff bio-filaments subject to a deflecting force
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