排序方式: 共有26条查询结果,搜索用时 0 毫秒
1.
Pelayo-Ceja J. E. Zazueta-Raynaud A. Lopez-Delgado R. Alvarez-Ramos M. E. Saucedo-Flores E. Ruelas-Lepe R. Orona-Magallanes F. Guerrero-Gonzalez R. Ayon A. 《Microsystem Technologies》2022,28(6):1505-1513
Microsystem Technologies - We report an anomalous Stokes shift effect observed in colloidal solutions containing down-shifting Carbon quantum dots (CQDs) of different sizes that is expected to have... 相似文献
2.
Mehra A. Xin Zhang Ayon A.A. Waitz I.A. Schmidt M.A. Spadaccini C.M. 《Journal of microelectromechanical systems》2000,9(4):517-527
As part of a program to develop a micro gas turbine engine capable of producing 10-50 W of electrical power in a package less than one cubic centimeter in volume, we present the design, fabrication, packaging, and experimental test results for the 6-wafer combustion system for a silicon microengine. Comprising the main nonrotating functional components of the engine, the device described measures 2.1 cm×2.1 cm×0.38 cm and is largely fabricated by deep reactive ion etching through a total thickness of 3800 μm. Complete with a set of fuel plenums, pressure ports, fuel injectors, igniters, fluidic interconnects, and compressor and turbine static airfoils, this structure is the first demonstration of the complete hot flow path of a multilevel micro gas turbine engine. The 0.195 cm3 combustion chamber is shown to sustain a stable hydrogen flame over a range of operating mass flows and fuel-air mixture ratios and to produce exit gas temperatures in excess of 1600 K. It also serves as the first experimental demonstration of stable hydrocarbon microcombustion within the structural constraints of silicon. Combined with longevity tests at elevated temperatures for tens of hours, these results demonstrate the viability of a silicon-based combustion system for micro heat engine applications 相似文献
3.
Michael Leyer Daniel Kronsbein Richard Willis Ayon Chakraborty Jürgen Moormann 《国际生产研究杂志》2016,54(11):3229-3242
This article presents the practices of Australian and German financial service providers regarding the implementation of shop-floor control within different types of service systems. The results delivered in this article should serve as a guideline for future research to develop and adapt methods for shop-floor control in financial service systems. Interviews with 25 experts from the Australian and German financial services industry reveal novel insights into the practice of shop-floor control, suggesting that methods and concepts from manufacturing are only used to a limited extent for shop-floor control. Shop-floor control is mostly used to react quickly to unexpected deviations due to a low usage of forecasts and information systems. Thus, there seems to be improvement potential in the financial services industry in comparison with in the manufacturing industry in terms of shop-floor control. Further research within the production research area should use the empirical insights to test and adapt existing methods and to develop new ones, taking cultural differences into account. 相似文献
4.
Garcia-Monge Janeth Alexandra Vazquez-Colon Clarissa D. Ponce Arturo Guisbiers Gregory Ayon Arturo A. 《Microsystem Technologies》2022,28(6):1497-1504
Microsystem Technologies - We report the synergistic photoluminescent effect observed in heterogeneous colloidal solutions comprising different volumetric concentrations of Si and CdTe quantum dots... 相似文献
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Kuo-Shen Chen Arturo Ayon S. Mark Spearing 《Journal of the American Ceramic Society》2000,83(6):1476-1484
Strength characterizations and supporting analysis of mesoscale biaxial flexure and radiused hub flexure single-crystal silicon specimens are presented. The Weibull reference strengths of planar biaxial flexure specimens were found to lie in the range 1.2 to 4.6 GPa. The local strength at stress concentrations was obtained by testing radiused hub flexure specimens. For the case of deep reactive ion-etched specimens the strength at fillet radii was found to be significantly lower than that measured on planar specimens. This result prompted the introduction of an additional isotropic etch after the deep reactive ion etch step to recover the strength in such regions. The mechanical test results reported herein have important implications for the development of highly stressed microfabricated structures. The sensitivity of the mechanical strength to etching technique must be accounted for in the structural design cycle, particularly with regard to the selection of fabrication processes. The scatter of data measured in the mechanical tests clearly illustrated the need to use a probabilistic design approach. Weibull statistics may be the appropriate means to describe the data, although a simple two-parameter Weibull model only provides a moderately good fit to the experimental data reported in this study. 相似文献
7.
Kuo-Shen Chen Ayon A.A. Xin Zhang Spearing S.M. 《Journal of microelectromechanical systems》2002,11(3):264-275
The ability to predict and control the influence of process parameters during silicon etching is vital for the success of most MEMS devices. In the case of deep reactive ion etching (DRIE) of silicon substrates, experimental results indicate that etch performance as well as surface morphology and post-etch mechanical behavior have a strong dependence on processing parameters. In order to understand the influence of these parameters, a set of experiments was designed and performed to fully characterize the sensitivity of surface morphology and mechanical behavior of silicon samples produced with different DRIE operating conditions. The designed experiment involved a matrix of 55 silicon wafers with radius hub flexure (RHF) specimens which were etched 10 min under varying DRIE processing conditions. Data collected by interferometry, atomic force microscopy (AFM), profilometry, and scanning electron microscopy (SEM), was used to determine the response of etching performance to operating conditions. The data collected for fracture strength was analyzed and modeled by finite element computation. The data was then fitted to response surfaces to model the dependence of response variables on dry processing conditions 相似文献
8.
Debabrata Chatterjee Ayon Sengupta Anannya Mitra Susan Basak 《Inorganic chemistry communications》2006,9(12):1219-1222
Kinetics of oxidation of catechol (H2cat) to benzoquinone (BQ) and, ascorbate (HA−) to dehydroascorbic acid (A) by [RuIII(tpy)(pic)(OH)]+ (1) (tpy = 2,2’6’,2”-terpyridine; pic− = picolinate) have been studied as function of [H2cat] (or [HA−]), ionic strength (0.01 − 0.25 M), temperature (10–30 °C) at a constant pH = 3.2, using stopped-flow and rapid-scan diode array spetrophotometric techniques. The rate of reaction of 1 with HA− was found to be very fast as compared to that of with H2cat. The kinetic data and activation parameters are interpreted in terms of an associative interchange mechanism. Analysis of spectral and kinetic data revealed that the reaction of 1 with catechol proceeds by a straightforward outer-sphere electron transfer pathway, whereas, reduction of 1 with HA− involves ion-pair formation. 相似文献
9.
Ayon Tarafdar Navin Chandra Shahi Anupama Singh Ranjna Sirohi 《Food and Bioprocess Technology》2018,11(1):164-171
A method for reducing the energy consumption during freeze drying has been proposed. Water activity variation with time has been explored for button mushroom (Agaricus bisporus L.). The effect of primary and secondary drying temperatures on water activity was found significant (p < 0.05) as compared to sample thickness and pressure. The economics of the process showed that an energy reduction up to 34.9% could be achieved if the final water activity was constrained at 0.6. Artificial neural network tool has been used to develop a model for predicting the water activity precisely for a given combination of time, initial moisture content, vacuum pressure, sample thickness, and primary and secondary drying temperatures. The model-predicted values were found to be in good agreement (R = 0.97) with the experimental data. The model developed is expected to extend its aid in energy reduction for freeze drying of other food products. 相似文献
10.
Mehra A. Ayon A.A. Waitz I.A. Schmidt M.A. 《Journal of microelectromechanical systems》1999,8(2):152-160
As part of an effort to develop a micro gas turbine engine capable of providing 10-50 W of electrical power in a package less than one cubic centimeter in volume, we report the fabrication and testing of the first hydrogen combustor micromachined from silicon. Measuring 0.066 cm 3 in volume, and complete with a fuel manifold and set of fuel injector holes, the fabrication of the device was largely enabled by the use of deep reactive ion etching (DRIE) and aligned silicon wafer bonding. The 150-W microcombustor has a power density in excess of 2000 MW/m3 and has been successfully demonstrated to provide turbine inlet temperatures up to 1800 K. After 15 h of experimental tests, the combustor maintained its mechanical integrity and did not exhibit any visible damage. Combined with the results of a materials oxidation study, these tests are used to demonstrate the satisfactory performance of silicon in the harsh oxidizing environment of a combustion chamber 相似文献