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排序方式: 共有237条查询结果,搜索用时 10 毫秒
61.
Use of Fenton oxidation to improve the biodegradability of a pharmaceutical wastewater 总被引:12,自引:0,他引:12
Tekin H Bilkay O Ataberk SS Balta TH Ceribasi IH Sanin FD Dilek FB Yetis U 《Journal of hazardous materials》2006,136(2):258-265
The applicability of Fenton's oxidation to improve the biodegradability of a pharmaceutical wastewater to be treated biologically was investigated. The wastewater was originated from a factory producing a variety of pharmaceutical chemicals. Treatability studies were conducted under laboratory conditions with all chemicals (having COD varying from 900 to 7000 mg/L) produced in the factory in order to determine the operational conditions to utilize in the full-scale treatment plant. Optimum pH was determined as 3.5 and 7.0 for the first (oxidation) and second stage (coagulation) of the Fenton process, respectively. For all chemicals, COD removal efficiency was highest when the molar ratio of H(2)O(2)/Fe(2+) was 150-250. At H(2)O(2)/Fe(2+) ratio of 155, 0.3M H(2)O(2) and 0.002 M Fe(2+), provided 45-65% COD removal. The wastewater treatment plant that employs Fenton oxidation followed by aerobic degradation in sequencing batch reactors (SBR), built after these treatability studies provided an overall COD removal efficiency of 98%, and compliance with the discharge limits. The efficiency of the Fenton's oxidation was around 45-50% and the efficiency in the SBR system which has two reactors each having a volume of 8m(3) and operated with a total cycle time of 1 day, was around 98%, regarding the COD removal. 相似文献
62.
For target tracking applications, wireless sensor nodes provide accurate information since they can be deployed and operated near the phenomenon. These sensing devices have the opportunity of collaboration among themselves to improve the target localization and tracking accuracies. An energy-efficient collaborative target tracking paradigm is developed for wireless sensor networks (WSNs). A mutual-information-based sensor selection (MISS) algorithm is adopted for participation in the fusion process. MISS allows the sensor nodes with the highest mutual information about the target state to transmit data so that the energy consumption is reduced while the desired target position estimation accuracy is met. In addition, a novel approach to energy savings in WSNs is devised in the information-controlled transmission power (ICTP) adjustment, where nodes with more information use higher transmission powers than those that are less informative to share their target state information with the neighboring nodes. Simulations demonstrate the performance gains offered by MISS and ICTP in terms of power consumption and target localization accuracy. 相似文献
63.
Cakli S Kilinc B Dincer T Tolasa S 《Critical reviews in food science and nutrition》2006,46(6):453-458
Slurry ice, a biphasic system consisting of small spherical ice crystals surrounded by seawater at subzero temperature, was evaluated as a new chilled storage method for whole sea bass (Dicentrarchus labrax) a sparidae fish species of remarkable commercial interests. In this study two different group of chilling methods were used during transportation; in slurry ice packaged (Group A), and flake ice packaged (Group B). The effect of this advanced system during transportation on quality losses and the shelf life of aquacultured sea bass was evaluated. Mesophilic counts for sea bass exceeded 7 log cfu/g, which is considered the maximum level for acceptability for freshwater and marine fish after 13 days for groups A and B. On day 13 TVB-N values of groups A and B, reached the legal limits (35 mg/100 g set for TVB-N) for consumption. According to the results of sensory analyses, up to day 9 all the groups were determined as "acceptable" but on day 13 the groups A and B were no longer acceptable. The main negative aspect related to quality loss in slurry ice group corresponded to the appearance of eyes and gills. Using slurry ice during transportation did not extend the shelf life of sea bass stored at 4 degrees C. 相似文献
64.
This paper presents a subcontractor information system (SIS) to support the estimating and project control functions of subcontractors and small∕medium-size contractors. For the proposed SIS to be simple and practical, it was developed in a spreadsheet program designed to maintain information related to resources and projects and to generate important business reports. Resource data are stored in six worksheets for labor, equipment, crews, material, subcontractors, and alternative methods of construction for various tasks. In addition, a separate worksheet is designed for each project to be used for estimating and control purposes. The latter worksheet allows the user to specify the work breakdown structure and optional methods for construction. As such, it represents a transparent estimating model that allows for quick what-if analysis regarding time and cost. In addition, the reporting worksheet provides information related to time, cost, and resource use at the individual and the multiproject levels. In a companion paper, the use of the SIS as basis for overall schedule optimization is described. 相似文献
65.
66.
Geothermal‐based hydrogen production, which basically uses geothermal energy for hydrogen production, appears to be an environmentally conscious and sustainable option for the countries with abundant geothermal energy resources. In this study, four potential methods are identified and proposed for geothermal‐based hydrogen production, namely: (i) direct production of hydrogen from the geothermal steam, (ii) through conventional water electrolysis using the electricity generated through geothermal power plant, (iii) by using both geothermal heat and electricity for high temperature steam electrolysis and/or hybrid processes, and (iv) by using the heat available from geothermal resource in thermochemical processes. Nowadays, most researches are focused on high‐temperature electrolysis and thermochemical processes. Here we essentially discuss some potential low‐temperature thermochemical and hybrid cycles for geothermal‐based hydrogen production, due to their wider practicality, and examine them as a sustainable option for hydrogen production using geothermal heat. We also assess their thermodynamic performance through energy and exergy efficiencies. The results show that these cycles have good potential and attractive overall system efficiencies over 50% based on a complete reaction approach. The copper‐chlorine cycle is identified as a highly promising cycle for geothermal‐hydrogen production. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
67.
Tolga Yuret 《Scientometrics》2018,117(1):105-121
Few academics go on to become professors at prestigious universities. Candidates must have a very strong educational background in addition to demonstrating a high level of effort and academic ability. We analyze the educational backgrounds of elite academics with two main objectives. First, we evaluate the educational institutions in terms of the number of graduates who have become professors at prestigious universities. Second, we analyze the professor’s path to success to shed light on issues such as mobility and inbreeding. We analyze the educational backgrounds of 14,310 full professors from 48 top universities in the United States. We confine our analysis to undergraduate and graduate degrees attained within the United States. Some of our main findings are as follows: (a) 72% (44%) of the professors obtained their Ph.D. (undergraduate) degrees from 20 universities. (b) The top 17 universities with the highest number of Ph.D. alumni who became professors at prestigious universities were also among the top 20 universities with the highest number of undergraduate alumni who became professors at prestigious universities. (c) 70% of the professors who work at private universities obtained their degrees from private universities, whereas only half of the professors who work at public universities obtained their degrees from public universities. (d) Only 16% of the professors live in the same state in which they obtained their undergraduate degrees, which indicates a much higher mobility than the average graduate degree holder. (e) Only 4% of the professors work at the universities from which they graduated. (f) Professors graduate significantly faster than the median Ph.D. graduate. 相似文献
68.
This study focuses on carrying out weighted digraph-based mathematical construction of hypermedia and user navigation on hypermedia and making a presentation of “weighted” forms of known stratum and compactness. In the instructional Web design researches, the structural analysis of navigation on the hypermedia is important in modeling the behaviors that the learners perform while using this kind of media. Therefore, new conceptions of the presented usage of new measures towards this goal are also discussed within the scope of our study. 相似文献
69.
We present the Finite-Window Robust Sequential Estimator for the detection and analysis of corrosion in range images of gas
pipelines. This statistically robust, real-time technique estimates the pipeline surface range function in the presence of
noise, surface deviations, and changes in the underlying model. Deviations from the robust surface fit, corresponding to statistical
outliers, represent potential areas of corrosion. Because the algorithm estimates surface parameters over a finite, sliding
window of data, it can track moderately high-order surfaces using lower order models. The system is consistent, objective,
and non-destructive and can be used with the pipeline in service.
Received: 7 September 1999 / Accepted: 2 November 2000 相似文献
70.
The State of the Art in Mobile Graphics Research 总被引:1,自引:0,他引:1
Capin Tolga Pulli Kari Akenine-M ller Tomas 《Computer Graphics and Applications, IEEE》2008,28(4):74-84
High-quality computer graphics let mobile-device users access more compelling content. Still, the devices' limitations and requirements differ substantially from those of a PC. This survey of mobile graphics research describes current solutions in terms of specialized hardware (including 3D displays), rendering and transmission, visualization, and user interfaces. 相似文献