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排序方式: 共有137条查询结果,搜索用时 328 毫秒
81.
Jose Alvarez‐Ramirez Monica Meraz Oscar Monroy Alejandra Velasco 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2002,77(6):725-734
An approach for the design of linear feedback controllers for anaerobic digestion systems is presented. The effluent chemical oxigen demand (COD) concentration and the dilution rate are taken respectively as the regulated and the manipulated variables. The control design is based on simple step‐response models of the process endowed with an input delay to account for dead‐times induced by measurement devices. The resulting feedback controller has a traditional proportional‐integral (PI) control structure, so it can be easily implemented with conventional control technologies. Since the concentration of volatile fatty acids can be easily and quickly measured as compared with COD concentration, it is used as a secondary measurement that is incorporated into the feedback loop scheme to enhance the robustness of the control scheme with respect of influent disturbances. The performance of the proposed control scheme is illustrated via numerical simulations and experimental work. © 2002 Society of Chemical Industry 相似文献
82.
Pulse shaping for high data rate ultra‐wideband wireless transmission under the Russian spectral emission mask 下载免费PDF全文
Simon Rommel Elizaveta P. Grakhova Antonio Jurado‐Navas Albert Kh. Sultanov Juan José Vegas Olmos Idelfonso Tafur Monroy 《International Journal of Communication Systems》2018,31(1)
This paper addresses impulse‐radio ultra‐wideband (IR‐UWB) transmission under the Russian spectral emission mask for unlicensed UWB radio communications. Four pulse shapes are proposed and their bit error rate (BER) performance is both estimated analytically and evaluated experimentally. Well‐known shapes such as the Gaussian, root‐raised cosine, hyperbolic secant, and the frequency B‐spline wavelet are used to form linear combinations of component pulses, shaped to make efficient use of the spectral emission mask. Analytical BER values are derived using a Nakagami‐m model, and good agreement is found with the experimentally obtained BER. The proposed pulse shapes allow IR‐UWB transmission with BERs below the limit for a 7% overhead forward error correction, achieving distances of up to 6.5 m at 1 Gbit/s, 4.5 m at 1.25 Gbit/s, and 1 m at Gbit/s. These results confirm the viability of IR‐UWB transmission under the strict regulations of the Russian spectral emission mask. 相似文献
83.
J. Puerto A.M. Mármol L. Monroy F.R. Fernández 《International Transactions in Operational Research》2000,7(1):51-65
In this paper we use an extreme point approach to analyze some usual decision criteria for multiple attribute decision-making problems when partial information about the importance of the attributes is available. The obtained results show that the decision criteria to be chosen depend not only on the rationality principles, but also on the structure of the information set. We apply the obtained criteria to problems where the set of actions to be evaluated are either in qualitative and/or quantitative scales. 相似文献
84.
E. Monroy F. Calle E. Muñoz F. Omnès B. Beaumont P. Gibart 《Journal of Electronic Materials》1999,28(3):240-245
The influence of the photodetection mechanism on the performance of AlGaN ultraviolet (UV) detectors is analyzed by studying
the characteristics of photoconductors and photovoltaic Schottky diodes fabricated on the same samples. The photoconductive
response below the bandgap is not a direct function of the absorption coefficient. Instead, it is amplified by the dominant
photoconductive responsivity mechanism, which is attenuated as the chopping frequency increases. On the contrary, photovoltaic
detectors are characterized by a sharp UV/visible contrast, mainly dependent on the absorption properties of the material.
Thus, these detectors are more suitable for selective UV applications, such as ozone layer monitoring or flame detection. 相似文献
85.
86.
Lopez R. R. Caballero A. Yu X. Gibbon T. B. Jensen J. B. Monroy I. T. 《Photonics Technology Letters, IEEE》2010,22(5):263-265
87.
Gonzalez N. G. Zibar D. Caballero A. Monroy I. T. 《Photonics Technology Letters, IEEE》2010,22(5):335-337
88.
Gibbon T. B. Yu X. Gamatham R. Gonzalez N. G. Rodes R. Jensen J. B. Caballero A. Monroy I. T. 《Microwave and Wireless Components Letters, IEEE》2010,20(2):127-129
89.
Nanocomposites: Nanocomposite Hydrogels as Platform for Cells Growth,Proliferation, and Chemotaxis (Small 35/2016) 下载免费PDF全文
90.
Prediction of drip-loss, pH, and color for pork using a hyperspectral imaging technique 总被引:5,自引:0,他引:5
Many subjective grading methods with poor repeatability and tedious procedures are still widely used in meat industry. In this study, a hyperspectral-imaging-based technique was investigated to evaluate its potentials for objective determination of pork quality attributes. The system extracted spectral and spatial characteristics simultaneously to determinate the quality attributes, drip loss, pH, and color, of pork meat. Six feature band images were selected for predicting the drip loss (459, 618, 655, 685, 755 and 953nm), pH (494, 571,637, 669, 703 and 978nm) and color (434, 494, 561, 637, 669 and 703nm), respectively. Two intensity indices of the band images were used as inputs to establish neural network models to predict the quality attributes. The results showed that with the hyperspectral-imaging system, the drip loss, pH, and color of pork meat could be predicted with correlation coefficients of 0.77, 0.55 and 0.86, respectively. Pork meat could be classified based on their exudative characteristics and color successfully. 相似文献