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排序方式: 共有189条查询结果,搜索用时 15 毫秒
1.
C. Favazza J. Trice A. K. Gangopadhyay H. Garcia R. Sureshkumar Ramki Kalyanaraman 《Journal of Electronic Materials》2006,35(8):1618-1620
Most metals on SiO2 have a finite contact angle and are therefore subject to dewetting during thermal processing. The resulting dewetting morphology
is determined primarily by nucleation and growth or instabilities. The dewetting mechanism implies a disordered spatial arrangement
for homogeneous nucleation, but an ordered one for instabilities such as spinodal decomposition. Here, we show that the morphology
of laser-melted ultrathin Co film (4-nm thick) can be attributed to dewetting via an instability. Dewetting leads to breakup
of the continuous Co film into nanoparticles with a monomodal size distribution with an average particle diameter of 75 nm±23
nm. These nanoparticles have short-range order (SRO) of 130 nm in their separation. This result has important implications
for nanomanufacturing with a robust spacing or size selection of nanoparticles in addition to spatial ordering. 相似文献
2.
Mehrdad Djavid Mohammad Hadi Tavakoli Dastjerdi Moab Rajan Philip Dipayan Datta Choudhary Thi Tan Pham Abdallah Khreishah Hieu Pham Trung Nguyen 《Photonic Network Communications》2018,35(1):90-96
We present, for the first time, the design of a low-cross talk scalable permutation switch employing photonic crystal ring resonators in an optical network. Through this novel approach, the transition between different states of the \(2 \times 2\) optical switch, as the basic element, is achieved by applying different operating wavelengths. Subsequently, the shuffling mechanisms in \(3 \times 3\) and \(4 \times 4\) optical networks are realized by controlling the position of photonics crystal ring resonators. Lowest cross talk levels of 6 and 5% are obtained for “bar” and “cross” switching states, respectively. 相似文献
3.
J.S. Yoo I.O. Parm U. Gangopadhyay Kyunghae Kim S.K. Dhungel D. Mangalaraj Junsin Yi 《Solar Energy Materials & Solar Cells》2006,90(18-19):3085-3093
Low-cost, large area, random and mask less texturing scheme independent of crystal orientation are some of the factors that significantly influence the success of terrestrial photovoltaic technology. This work is focused on the texturing of the silicon surface microstructures by reactive ion etching using a multi-hollow cathode system. Desirable texturing effect has been achieved by applying a radio-frequency power of about 20 W per hollow cathode glow. The etched silicon surface shows almost zero reflectance in the visible region as well as in near-IR region. The silicon surface is covered by columnar microstructures with diameters ranging from 50 to 100 nm and with a depth of about 500 nm. Solar cells with efficiencies of 11.7% and 10.2% with black mono-crystalline and multi-crystalline silicon wafers, respectively, were successfully fabricated and tested. 相似文献
4.
The phenomenon of terrorism is deemed one of the fundamental challenges in national security. Creating defensive technologies to mitigate terrorist attacks requires a simultaneous investigation of contextual relationships among their various dimensions. We proposed and evaluated a graph-based methodology to analyze terrorist networks through co-clustering in a multimode basis. Since there are many heterogeneous relationships in terrorist networks depending on the dimensions used during analysis, we utilized the clustering indicators of the multimode structure discovered in bi- and multimode graphs. Objects and activities that co-occur during terrorist attacks are identified by applying conventional clustering on those indicators. The novelty of our method is in the incremental creation of the multimode structure using its bi-mode counterparts. Our approach is evaluated using these measures: clustering stability and association confidence. The experimental results yields encouraging results in terms of simultaneous clustering of heterogeneous objects in terrorist networks. 相似文献
5.
Rajesh Shende Senthil Subramanian Shameem Hasan Steven Apperson Rajagopalan Thiruvengadathan Keshab Gangopadhyay Shubhra Gangopadhyay Paul Redner Deepak Kapoor Steven Nicolich Wendy Balas 《Propellants, Explosives, Pyrotechnics》2008,33(2):122-130
This paper reports on the synthesis of the nanoenergetic composites containing CuO nanorods and nanowires, and Al‐nanoparticles. Nanorods and nanowires were synthesized using poly(ethylene glycol) templating method and combined with Al‐nanoparticles using ultrasonic mixing and self‐assembly methods. Poly(4‐vinylpyridine) was used for the self‐assembly of Al‐nanoparticles around the nanorods. At the optimized values of equivalence ratio, sonication time, and Al‐particle size, the combustion wave speed of 1650 m s−1 was obtained for the nanorods‐based energetics. For the composite of nanowires and Al‐nanoparticles the speed was increased to 1900 m s−1. The maximum combustion wave speed of 2400 m s−1 was achieved for the self‐assembled composite, which is the highest known so far among the nanoenergetic materials. It is possible that in the self‐assembled composites, the interfacial contact between the oxidizer and fuel is higher and resistance to overall diffusional process is lower, thus enhancing the performance. 相似文献
6.
The rth order nonlinearity of a Boolean function is an important cryptographic criterion in analyzing the security of stream as well as block ciphers. It is also important in coding theory as it is related to the covering radius of the Reed-Muller code R(r,n). In this paper we deduce the lower bounds of the second order nonlinearities of the following two types of Boolean functions:
- 1.
- with d=22r+2r+1 and , where n=6r.
- 2.
- , where x,y∈F2t,n=2t,n?6 and i is an integer such that 1?i<t,gcd(2t-1,2i+1)=1.
7.
8.
Ghosh Manosij Kundu Tuhin Ghosh Dipayan Sarkar Ram 《Multimedia Tools and Applications》2019,78(18):25753-25779
Multimedia Tools and Applications - Facial Emotion Recognition (FER) is an important research domain which allows us to provide a better interactive environment between humans and computers. Some... 相似文献
9.
Prasun K. Gangopadhyay B. Maathuis P. Van Dijk 《International journal of remote sensing》2013,34(24):5555-5571
Subsurface and surface coal fires form serious environmental, economic and safety problems in coal‐producing countries like China and India. Remote sensing offers the possibility of detecting and studying thermal anomalies due to coal fires. Emissivity plays an important role in determining the surface temperature of a body using remotely sensed data. In the present study an attempt is made to use satellite‐derived emissivity to estimate the surface temperature in Wuda, north China. With the use of multispectral thermal Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data (five bands in 8.125–11.65 µm region) in combination with a Temperature/Emissivity Separation (TES) algorithm, the anomalous pixels due to coal fires can be extracted from the background to achieve a qualitative study of coal fires. In the present study, during night‐time overpass of ASTER, satellite images have been recorded and simultaneous field measurements were collected. These field measurements were used to process the satellite thermal data and to validate the results obtained. Using the TES approach, satellite‐based temperature corresponded well with actual field measurements at selected locations. 相似文献
10.
An object-oriented framework in essence defines an architecture for a family of applications or subsystems in a given domain. Every application in the family obeys these architectural restrictions. Such frameworks are typically delivered as collections of inter-dependent abstract classes, together with their concrete subclasses. The abstract classes and their interdependencies implicitly realize the architecture. Developing a new application reusing classes of a framework requires a thorough understanding of the framework architecture.We introduce an approach called Design by Framework Completion, in which an exemplar (an executable visual model for a minimal instantiation of the architecture) is used for documenting frameworks. We propose exploration of exemplars as a means for learning the architecture, following which new applications can be built by replacing selected pieces of the exemplar. For the piece to be replaced, the inheritance lattice around its class provides the space of alternatives, one of these classes may be suitably adapted (say, by sub-classing) to create the new replacement.Design by Framework Completion proposes a paradigm shift when designing in presence of reusable components: It enables a much simpler top-down approach for creating applications, as opposed to the prevalent search for components and assemble them bottom-up strategy. We believe that this paradigm shift is essential because components can only be fitted together if they all obey the same architectural rules that govern the framework. 相似文献