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Nanomechanical Logic Elements Based on Coupled Nanopillars
S. H. Kim,S. J. Hong,A. S. Rana,김현석 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.7
We demonstrate the possibility of using coupled nanopillars as nanomechanical logic elements byregulating the flow of electric current between the nanopillars and the source and drain electrodes. The nanopillar, which is fabricated from a silicon-on-insulator (SOI) wafer and is located betweentwo facing electrodes, oscillates with frequencies in the radiofrequency range of 10 - 1000 MHz. Electrons are transported between the nanopillar and the electrodes via an island-like gold layerthermally deposited on the top of the nanopillar in response to externally applied ac and dc biases. Nanomechanical logic gates are designed using the coupled nanopillars and a switched-capacitormodel. With this configuration, several logic gates, such as an inverter and NAND, NOR, andXOR gates, can be effectively implemented.
Kim, S.,Rana, K.,Ahn, J. H. Royal Society of Chemistry 2016 Journal of materials chemistry. A, Materials for e Vol.4 No.48
<P>Interest in high-power, lightweight, and flexible lithium-ion batteries (FLIBs) to fulfill the energy requirements of future flexible electronic devices is increasing. To fabricate a thin FLIB, which consists of flexible components, we herein describe, as a model study, a hybrid electrode structure that includes no binders, conductive agents or metal current collectors. A freestanding ultrathin graphite (FSG) film was used as both the current collector and the anode, over which vertically aligned Li4Ti5O12 (LTO) nanowire (NW) arrays were grown. For comparison, two different additive-free electrodes consisting of an LTO NW array on titanium (LTO-Ti) and an LTO NW array on FSG (LTO-FSG) were prepared; they exhibited discharge capacities of 158 and 154 mA h g(-1), respectively. The capacities remained approximately stable even after 500 cycles at a 20C charge/discharge rate, revealing outstanding cycling stability of the electrodes. The high-rate performance of the additive-free LTO-FSG electrode revealed excellent rate capability. Finally, the flexible LTO-FSG electrode was used to assemble an FLIB. This novel approach of preparing an additive-free and flexible hybrid electrode enabled the fabrication of a high-power, thin, and lightweight FLIB that exhibited no physical deterioration or performance loss.</P>
Md. B. Hossain,Saruar J. Shourov,Md. M. Rana,Md. S. Anower 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.4
The work describing in this paper develops and demonstrates an analog to digital conversion (ADC) technique based an electronic device which is used to detect gas leakage using mechanical sensors at households, industries, vehicles, gas stations etc. where detection of gas leakage is an important issue to avoid any uncertainty. The device consists of a processing section which takes input, processes it and provides output. Corresponding to this output, it starts exhaust fan and light emitting diode (LED) is on, if concentration of gas exceeds a certain level, starts buzzer (alarm), switch off the gas power supply and notifies the consumer by sending an alert message through the monitoring computer. The gas concentration level for a particular operational area will be stored in Matlab “Database Explorer Tool” in order to get an overview of gas status of this area for future analysis such as probability to take accident and so on.
Vinod Chhokar,Vikas Beniwal,Anil Kumar,J. S. Rana,Seema,Raj Kumar Salar,K. S. Nehra 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.5
A tannase (E.C. 3.1.1.20) producing fungal strain was isolated from soil and identified as Aspergillus heteromorphus MTCC 8818. Maximum tannase production was achieved on Czapek Dox minimal medium containing 1% tannic acid at a pH of 4.5 and 30°C after 48 h incubation. The crude enzyme was purified by ammonium sulfate precipitation and ion exchange chromatography. Diethylaminoethyl-cellulose column chromatography led to an overall purification of 39.74-fold with a yield of 19.29%. Optimum temperature and pH for tannase activity were 50°C and 5.5 respectively. Metal ions such as Ca2+,Fe2+, Cu1+, and Cu2+ increased tannase activity, whereas Hg2+, Na1+, K1+, Zn2+, Ag1+, Mg2+, and Cd2+ acted as enzyme inhibitors. Various organic solvents such as isopropanol,isoamyl alcohol, benzene, methanol, ethanol, toluene, and glycerol also inhibited enzyme activity. Among the surfactants and chelators studied, Tween 20, Tween 80, Triton X-100, EDTA, and 1, 10-o-phenanthrolein inhibited tannase activity, whereas sodium lauryl sulfate enhanced tannase activity at 1% (w/v).