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排序方式: 共有237条查询结果,搜索用时 15 毫秒
11.
12.
Aline Simo Bonex Mwakikunga Bertrand T. Sone Basil Julies Reginaldt Madjoe Malik Maaza 《International Journal of Hydrogen Energy》2014
Mott-type VO2 oxide nanobelts are demonstrated to be effective hydrogen gas sensors at room temperature. These nanobelts, synthesized by hydrothermal process and exhibiting the VO2 (A) crystallographic phase, display room temperature H2 sensitivity as low as 0.17 ppm. The nanobelts (ultralong belt-like) nanostructures could be an ideal system for fully understanding dimensionally confined transport phenomena in functional oxides and for building functional devices based on individual nanobelts. 相似文献
13.
Basil T. Wong M. Pinar Mengüç 《International Journal of Heat and Mass Transfer》2009,52(11-12):2632-2645
A detailed numerical simulation for electron-beam heating of n-doped silicon is presented. Electron-beam penetration is modeled using electron-beam transport equation (EBTE). The EBTE is solved by using a Monte Carlo (MC) method to determine the electron deposition distributions, including electron density deposition and optical phonon generation. Electron and phonon temperatures of the film are then determined using electron–phonon hydrodynamic equations (EPHDEs) coupled with the deposition distributions obtained from the MC simulation. The combined EBTE and EPHDEs results indicate that an electron beam creates a depletion region near the surface of incidence and causes non-equilibrium between electron and phonon temperatures. 相似文献
14.
Agustín Jiménez Avello Basil Mohammed Al‐Hadithi Marta Ines Gonzalez Garcia Jose Maria Lopez Rubio 《风能》2014,17(1):57-74
In this paper, a new algorithm, difference equation matrix model (DEMM), in the framework of model predictive control (MPC) is introduced. Instead of the standard dynamic matrix control (DMC), which is based upon step response method that has been used in most research works, we propose a new approach based upon a DEMM for model prediction. It has shown that DEMM has proven to be less computational and thus faster than the original DMC for real time applications. Thus, the drawbacks of DMC for online identification or adaptive design could be avoided. The control of wind turbines is carried out in order to decrease the cost of wind energy by increasing the efficiency, and thus the energy capture, or by reducing structural loading and increasing the lifetimes of the components and turbine structures. Modeling of wind turbine has been carried out. Effect of noise and disturbance on the system has been also studied. The results obtained show that the proposed DEMM minimizes the effect of the disturbance and produces an accurate and smooth control. Significant improvements in the regulation of rotor speed at high wind speeds are obtained from the proposed DEMM, where control set points are obtained ahead of the disturbance, saving the turbine of the negative effects of them and thus increasing its lifetime. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
15.
An experimental investigation was conducted to reduce the parasitic noise appearing on the output of a 6-W CW YAG:Nd+3laser. Initially, low-frequency fluctuations as high as 30 percent and relaxation oscillation bursts exceeding 80 percent of the CW power level were present. Low-frequency modulation was reduced by the addition of an active feedback loop to control lamp current. Relaxation oscillations were determined to be influenced by laser rod cooling, pump-lamp aging, vibration, and intracavity optical interface quality. At the conclusion of the program, low-power fluctuations and relaxation oscillation excursions did not exceed 2 percent. 相似文献
16.
Basil Papadopoulos Konstantinos P. Tsagarakis Andreas Yannopoulos 《Canadian Metallurgical Quarterly》2007,133(6):581-586
This paper analyzes cost data pertinent to the municipal wastewater treatment plants (MWTP) in Greece. First, data have been collected with onsite visits and contain the land size necessary for a MWTP, the construction cost, and the operation and maintenance cost of existing wastewater treatment facilities. Second, they come from analytical budgeting of natural wastewater treatment system units. Twelve equations of the form ln?Yi = A0i+A1i?ln?Xi are estimated both with ordinary least squares (OLS) and fuzzy linear regression (FLR). The root mean square error and the mean absolute error are used as fitting measures for the comparison of the OLS with the fuzzy estimations. It is shown that the FLR did produce very similar estimates but slightly inferior to those of OLS in most of the cases for these particular datasets. 相似文献
17.
Parul Srivastava P. Agarwal George Basil 《International journal of remote sensing》2013,34(13):5036-5052
Multi-sensor aerosol data sets are analysed to examine the aerosol characteristics over the Delhi national capital region. Both the Multiple-angle Imaging Spectroradiometer (MISR) and Moderate Resolution Imaging Spectroradiometer (MODIS) capture the seasonal cycle of aerosol optical depth (AOD) as observed by ground-based measurements. However, AOD from MISR shows a low bias relative to AOD from MODIS, which increases linearly at high AOD conditions. A large difference (by >25 W m–2 per unit AOD) in the top-of-atmosphere direct radiative forcing efficiency derived from MODIS and MISR-retrieved AOD is observed during the winter and pre-monsoon seasons relative to the other seasons. The ubiquitous presence of dust (as indicated by non-spherical particle fraction to AOD and linear depolarization ratio values) is observed throughout the year. The aerosol layer is mostly confined to within 2 km of surface in the winter and post-monsoon seasons, while it expands beyond 6 km in the pre-monsoon and monsoon seasons. Columnar AOD is found to be highly sensitive to aerosol vertical distribution. The applicability of multi-sensor data sets and climatic implications are discussed. 相似文献
18.
The first part of this paper was published in Journ. Petrol. Geol. 8(4) 373–388. The Author here concludes his presentation: the Summary and Conclusions, and the references which follow, apply to both sections. 相似文献
19.
Hongzhi Xie Yi‐Fen Li Hiromi K. Kagawa Jonathan D. Trent Kumara Mudalige Mircea Cotlet Basil I. Swanson 《Small (Weinheim an der Bergstrasse, Germany)》2009,5(9):1036-1042
Genetic engineering of a novel protein–nanoparticle hybrid system with great potential for biosensing applications and for patterning of various types of nanoparticles is described. The hybrid system is based on a genetically modified chaperonin protein from the hyperthermophilic archaeon Sulfolobus shibatae. This chaperonin is an 18‐subunit double ring, which self‐assembles in the presence of Mg ions and ATP. Described here is a mutant chaperonin (His‐β‐loopless, HBLL) with increased access to the central cavity and His‐tags on each subunit extending into the central cavity. This mutant binds water‐soluble semiconductor quantum dots, creating a protein‐encapsulated fluorescent nanoparticle. The new bioconjugate has high affinity, in the order of strong antibody–antigen interactions, a one‐to‐one protein–nanoparticle stoichiometry, and high stability. By adding selective binding sites to the solvent‐exposed regions of the chaperonin, this protein–nanoparticle bioconjugate becomes a sensor for specific targets. 相似文献
20.
This article responds to "Coaching at the Top: Assisting A Chief Executive and His Team ' (M. M. Krajl, 2001 see record 2001-01213-005) by critiquing the article. It extends the discussion by focusing on the desired characteristics of a case study and how a professional literature can be derived from well constructed case studies. Applying these principles to Krajl's article, the author notes some issues concerning the intervention and preceding assessment, including the choice of the term coaching to describe complex and multifaceted interventions. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献