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1.
DNA self-assembly has been advocated as a possible technique for bottom-up manufacturing of scaffolds for computing systems in the nanoscale region. However, self-assembly is affected by different types of errors (such as growth and facet roughening) that severely limit its applicability. Different methods for reducing the error rate of self-assembly using tiles as basic elements have been proposed. A particularly effective method relies on snake tile sets that utilize a square block of even size (i.e., 2k times 2k tiles, k = 2, 3,.. .). In this paper, an odd-sized square block [i.e., (2k -1) times (2k - 1)] is proposed as basis for the snake tile set. Compared with other tile sets, the proposed snake tile sets achieve a considerable reduction in error rate at a very modest reduction in growth rate. Growth and facet roughening errors are considered and analytical results are presented to prove the reduction in error rate compared with an even-sized snake tile set. Simulation results are provided. 相似文献
2.
《IEEE sensors journal》2008,8(11):1856-1861
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《IEEE transactions on magnetics》2009,45(7):2899-2901
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《IEEE transactions on magnetics》2009,45(6):2386-2388
5.
Microsystem With Fluidic and Optical Interface for Inline Measurement of ${rm CO}_{2}$ in Oil Fields
Motivated by the need for inline measurements in natural gas and oil exploitation, we developed a microfluidic system which is suitable for chemical measurements by optical methods. It consists of a microfluidic system allowing the separation of gas and liquid phases so that gas can be optically analyzed. This system takes advantage of surface tension effects in tiny microchannels. The application is the measurement of carbon dioxide (CO2) concentration by evaluating absorption of infrared light at a wavelength of 4.24 mum. Measurements have been successfully performed in the 0-70 bars pressure range. 相似文献
6.
Chengbao Jiang Zan Yao 《IEEE transactions on magnetics》2010,46(1):10-14
We have studied the composition dependence, thermal stability, long-term stability at 500°C, and magnetic properties of the nanostructural TbCu7-type (1:7) Sm-Co-Ti alloys. We prepared the SmCox-0.4Ti0.4 alloys with a wide composition range from x = 5.0 to x = 8.5 by high-energy ball-milling, followed by annealing at 700-1100°C for 2 h. After annealing at 700°C, the powders with x = 7.0-8.5 showed a single 1:7 structure, while the powders with x = 5.0-6.5 presented the 1:7 plus CaCu5-type (1:5) structure. At an annealing temperature higher than 800°C, a minor Th2Zn17-type (2:17) phase precipitated in the matrix of the 1:7 phase. Intrinsic coercivity iHc exhibits a maximum of 2.3 T at room temperature and 0.4 T at 500°C in the x = 7.0 samples annealed at 700°C. The temperature coefficient of iHc seems stable as the Sm/Co ratio changes from 1/6.5 to 1/7.5. The coercivity decreased with increasing annealing temperature Ta, from 2.3 T at Ta = 700°C to 1.3 T at Ta = 1100°C, which is mainly attributed to the grain growth from 35 nm for Ta = 700°C to 1 ?m for Ta = 1100°C. After holding at 500°C for up to 360 h, the microstructure and magnetic properties of the 1:7-type nanograin alloys remained almost unchanged, indicating a structurally and magnetically long-term stabilization at the potential high-temperature application environment. 相似文献
7.
《IEEE sensors journal》2009,9(10):1173-1180
8.
Gutierrez-Martinez C. Santos-Aguilar J. 《IEEE transactions on instrumentation and measurement》2008,57(7):1362-1368
In this paper, a wideband-electric-field-sensing scheme that uses optically matched integrated optics electrooptic devices and coherence modulation of light is described. In a coherence modulation scheme, the integrated optics sensor detects the electric field and imprints it around an optical delay. The optical delay is generated by a birefringent optical waveguide in a lithium niobate (LiNbO3) integrated optics two-wave interferometer. The modulated optical delay, acting as an information carrier, is transmitted through an optical fiber channel. At the receiver, light is demodulated by a second integrated optics two-wave interferometer, which also introduces a second optical delay. The optical delays on the sensor and demodulator are matched at the same value. The integrated optics demodulator measures the autocorrelation of light around the optical delay value, and the imprinted electric field is recuperated as a linear variation of the received optical power. The matching of the sensor and demodulator allows a direct detection of the electric field, giving a unique feature to this fiber-integrated optics scheme. The experimental setup described here uses two pigtailed LiNbO3 electrooptic crystals: one acting as the electric field sensor and the other acting as the optical demodulator. The wideband sensing range on the experimental setup corresponds to frequencies between 0 and 20 kHz. 相似文献
9.
Nguyen Van Minh Doan Hai Long Nguyen The Khoi Yeongri Jung Sung-Jin Kim In-Sang Yang 《Nanotechnology, IEEE Transactions on》2008,7(2):177-180
Ti1-xFexO2 (x = 0.00-0.13) nanoparticle samples were prepared by hydrolysis method. We investigated the effects of Fe doping on the structural and magnetic properties of the Ti1-xFexO2 nanoparticle system. Scanning electron microscopy and X-ray diffraction measurements confirm that the particle size of the powder is in nanoscale, and that the magnetic Fe impurities substitute for the Ti sites in the anatase TiO2 phase. All the samples with x > 0 were found to be super-paramagnetic at room temperature by magnetization measurements. Raman spectra also strongly support that the Fe atoms go into the Ti-site in theTiO2 structure. For comparison, ceramic Ti1-xFexO2 samples were also prepared by usual ceramic method. Ferromagnetism was observed only in the ceramic Ti1-xFexO2 system. Additional Raman peak at around 610 cm-1 is observed only in the ceramic samples. This may be related to the clusters created by mixture of various valence state of Fe, which probably would be the cause for ferromagnetism observed in the ceramic Ti1-xFexO2 system. 相似文献
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11.
Chu-Hsuan Lin Cheng-Ya Yu Chieh-Chun Chang Cheng-Han Lee Ying-Jhe Yang Wei Shuo Ho Yen-Yu Chen Ming Han Liao Chia-Ting Cho Cheng-Yi Peng Chee Wee Liu 《Nanotechnology, IEEE Transactions on》2008,7(5):558-564
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《IEEE transactions on magnetics》2008,44(9):2107-2112
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《IEEE sensors journal》2009,9(1):13-19
14.
《IEEE transactions on magnetics》2009,45(9):3329-3333
15.
Surface Roughness in Plasma-Etched $hbox{As}_{bf 2}hbox{S}_{bf 3}$ Films: Its Origin and Improvement
Duk-Yong Choi Madden S. Rode A. Rongping Wang Ankiewicz A. Luther-Davies B. 《Nanotechnology, IEEE Transactions on》2008,7(3):285-290
We describe the microstructure of As2S3 films and its effect on the morphology of plasma-etched surfaces. The Raman spectroscopy and X-ray photoelectron spectroscopy demonstrated that the observed grainy morphology of etched As2S3 surfaces comes from differential chemical attack between different phases within the film. Two approaches were found to be effective for improving the smoothness of etched surfaces: a change in the plasma chemistry from CF4-O2 to CHF3-O2 and the application of a thin-conformal coating onto structures already patterned using CF4-O2 plasma. 相似文献
16.
《IEEE transactions on magnetics》2008,44(10):2247-2251
17.
Mingqi Chen Boric-Lubecke O. Lubecke V.M. 《IEEE transactions on instrumentation and measurement》2008,57(4):690-698
A robust high-accuracy analog-signal-processing 0.5-mum CMOS chip for real-time heart-rate (HR) extraction is presented. A novel peak-detector architecture is proposed and implemented to facilitate on-chip integration. The system is capable of processing electrocardiogram (ECG) signals with a peak-to-peak amplitude as low as 5 mV, without any prefiltering. Experimental results with prerecorded and real-time ECG signals have demonstrated the obtained R-R interval accuracy on the order of milliseconds. The system was also used to successfully extract HR intervals with Doppler radar. Such a system may significantly reduce ADC resolution and sampling speed requirements while providing high immunity to noise and DC offset drift. 相似文献
18.
《IEEE transactions on magnetics》2009,45(8):3207-3209
19.
《IEEE transactions on instrumentation and measurement》2009,58(5):1271-1272
The 62 papers in this special issue are extended versions of papers presented at the 2008 International Instrumentation and Measurement Technology Conference, held in Victoria, BC, Canada, from May 12 to 15. 相似文献
20.
《IEEE transactions on instrumentation and measurement》2010,59(1):188-194