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31.
Hager Atrous Nasreddine Benbettaieb Moncef Chouaibi Hamadi Attia 《International Journal of Food Properties》2017,20(7):1532-1546
Wheat and potato starches were treated by gamma irradiation (0, 3, 5, 10, 20, 35, and 50 kGy). Apparent amylose content, gelatinization maximum consistency, swelling power, viscosity, and textural parameters decreased in potato and wheat starch pastes as irradiation dose increased. Nevertheless, the decrease of apparent amylose content and swelling power was greater in potato starch than in wheat one. High gamma irradiation doses made potato starch granules more sensitive to shear. On the other hand, no modification in the granule shape was observed by scanning electron microscopy. However, through heat-treatment, starch granules destroyed as irradiation dose increased. Consequently, the effect of irradiation on granular structure appeared to be greater in potato starch than in wheat starch. 相似文献
32.
Moncef Aouadi 《热应力杂志》2013,36(3):270-285
The equations of generalized thermoelastic diffusion, based on the theory of Lord and Shulman with one relaxation time, are given in anisotropic media. A variational principle for the governing equations is obtained. Then we show that the variational principle can be used to obtain a uniqueness theorem under suitable conditions. A reciprocity theorem for these equations is given. The obtained results are valid for some special cases that can be deduced from our generalized model. 相似文献
33.
The Use of a Eutectic Mixture of Olive Pomace Oil Fatty Amides to Easily Prepare Sulfated Amides Applied as Lime Soap Dispersants 总被引:1,自引:0,他引:1
Faicel Rais Rochdi Baati Nesrin Damak Amel Kamoun Moncef Chaabouni 《Journal of the American Oil Chemists' Society》2008,85(9):869-877
Sulfated diethanolamides of fatty acids are known to be effective lime soap dispersing agents. However, their preparation
from fatty acids via fatty amides requires the use of organic solvents due to the high viscosity of both fatty amides and
sulfated fatty amides. This study shows that the preparation of sulfated fatty amides is relatively easy when using olive
pomace oil as the raw material. The latter, is converted into sulfated fatty amides by performing the following steps: saponification,
hydrolysis, esterification, amidation, and sulfation. In the final step, the mixture obtained has sufficient fluidity, due
to its high linoleic acid amide content, to obviate the use of organic solvents, as usually suggested in the literature. Characterization
of the product was carried out by chemical analyses, FTIR, 13C NMR, GC, and HPLC. It was shown that the yield of the amidation reaction is about 80%, and that of the sulfation reaction
can exceed 100% against the pure amide (more than one sulfate group could be linked to one amide molecule). On the other hand,
the Borghetty test showed that the product is an effective dispersant with a lime soap dispersing power equal to five. 相似文献
34.
This experimental study aims at investigating the behavior of reinforced concrete (RC) beams strengthened by unidirectional
and hybrid bidirectional fiber-reinforced polymer (FRP) sheets and subjected to cyclic loading. RC beams tested under cycled
loading were subsequently repaired using both epoxy injection and external FRP sheets, and then re-tested under monotonic
loading. Six RC beam specimens, two of which were control specimens and four were shear deficient, were upgraded with side-bonded
FRP sheets in the first phase of the experimental program. In the second phase, three of the damaged beams were repaired using
epoxy injection and unidirectional carbon fiber polymer (CFRP) sheets. The repairing method, FRP type, and FRP wrapping scheme
were the test variables investigated. Test results show that the repair schemes imparted significant mechanical improvements
in terms of ultimate shear capacity and ductility. The simultaneous application of epoxy injection and externally bonded FRP
sheets was found to be a highly effective repair technique. 相似文献
35.
In a Code Division Multiple Access (CDMA) network, multiple Mobile Hosts (MHs) can simultaneously transmit over the wireless
channel by using different codes. To assure an acceptable Quality of Service (QoS) for all MHs' flows, the network usually
tunes the transmit powers of all MHs to achieve a certain level of signal strength as compared to the noise and the interference
(SINR) for each MH. The traditional assumption in power control schemes is that the SINR requirement is statically determined
for each MH's flow.
In contrast, in this paper, we propose a scheme that dynamically adapts the SINR requirements of MH's flow based on its QoS
requirements and the conditions of the wireless channel between the MHs and the base station. As a result of this adaptation,
we show that network-level QoS measures such as fraction of packets meeting their delay requirements and energy consumed per
packet transmission are significantly better than in a scheme that statically fixes the SINR requirements. We show that the
adaptation approach works well for the Matched Filter (MF) and the Minimum Mean Squared Error (MMSE) receivers.
Our scheme uses a simple table-driven approach for optimally selecting the target SINR requirement for each MH at run time.
The entries in the table are computed off-line using a dynamic programming algorithm with the objective of maximizing a profit
function that balances the need for meeting the network-level QoS requirements and the cost of using a particular target SINR
for a given transmission.
Moncef Elaoud (M'97) received his B.Sc. (1988) his M.Sc. (1990) and his Ph.D. (2000) in electrical an computer engineering from the University
of Wisconsin-Madison. He is currently a senior research Scientist at Telcordia Technologies' Applied Research organization.
His main research interests are in the areas of quality of service, self-forming and self healing networks, auto-configuration,
and mobility management in wireless and ad-hoc networks.
Bechir Hamdaoui received the B.S. degrees in both electrical and mechanical engineering, and the M.S. degree in mechanical engineering from
the National School of Engineering in Tunis (BAC+6+DEA, ENIT), Tunisia, in 1997 and 1998, respectively. He also received the
M.S. degree in electrical and computer engineering from the University of Wiconsin, Madison, WI, in 2002, where he is currently
working toward the Ph.D. degree. From 1998 to 1999, he worked as a quality control and planning engineer on power generation
plant project under the supervision of FIAT Avio. His research focuses on various aspects in the area of computer networking
including mobile networks, wireless communication systems, and ad hoc networks.
Parameswaran Ramanathan received the B. Tech degree from the Indian Institute of Technology, Bombay, India, in 1984, and the M. S. E. and Ph. D.
degrees from the University of Michigan, Ann Arbor, in 1986 and 1989, respectively. Since 1989, Dr. Ramanathan has been faculty
member in the Department of Electrical & Computer Engineering, University of Wisconsin, Madison, where is presently a Full
Professor. He leads research projects in the areas of sensor networks and next generation cellular technology. In 1997–98,
he took a sabbatical leave to visit research groups at AT&T Laboratories and Telcordia Technologies.
Dr. Ramanathan's research interests include wireless and wireline networking, real-time systems, fault-tolerant computing,
and distributed systems. He is presently an Associate Editor for IEEE Transactions on Mobile Computing and Elsevier AdHoc
Networks Journal. He served as an Associate Editor for IEEE Transactions on Parallel and Distributed Computing from 1996–1999.
He has also served on program committees of conferences such as Mobicom, Mobihoc, International Conferences on Distributed
Systems and Networks, Distributed Computing Systems, Fault-tolerant Computing Symposium, Real-time Systems Symposium, Conference
on Local Computer Networks, and International Conference on Engineering Complex Computer Systems. He was the Finance and Registration
Chair for the 1999 Fault-tolerant Computing Symposium. He was the program chairman of the Workshop on Architectures for Real-time
Applications, 1994 and the program vice-chair for the International Workshop on Parallel and Distributed Real-time Systems,
1996. He is a member of Association of Computing Machinery and a senior member of IEEE. 相似文献
36.
37.
Hossjer O. Moncef M. 《IEEE transactions on information theory / Professional Technical Group on Information Theory》1993,39(2):594-608
The problem of extracting one out of a finite number of possible signals of known form given observations in an additive noise model is considered. Two approaches are studied: either the signal with shortest distance to the observed data or the signal having maximal correlation with some transformation of the observed data is chosen. With a weak signal approach, the limiting error probability is a monotone function of the Pitman efficacy and it is the same for both the distance-based and correlation-based detectors. Using the minimax theory of Huber, it is possible to derive robust choices of distance/correlation when the limiting error probability is used as performance criterion. This generalizes previous work in the area, from two signals to an arbitrary number of signals. Considered are M -type and R -type distances and also one-dimensional and two-dimensional signals. Some Monte Carlo simulations are performed to compare the finite sample size error probabilities with the asymptotic error probabilities 相似文献
38.
This paper deals with a fault detection technique for insulated-gate bipolar transistors (IGBTs) open-circuit faults in voltage source inverter (VSI)-fed induction motor drives. The novelty of this idea consists in analyzing the pulse-width modulation (PWM) switching signals and the line-to-line voltage levels during the switching times, under both healthy and faulty operating conditions. The proposed method requires line-to-line voltage measurement, which provides information about switching states and is not affected by the load. The fault diagnosis scheme is achieved using simple hardware and can be included in the existing inverter system without any difficulty. In addition, it allows not only accurate single and multiple faults diagnosis but also minimization of the fault detection time to a maximum of one switching period (T(c)). Simulated and experimental results on a 3-kW squirrel-cage induction motor drive are displayed to validate the feasibility and the effectiveness of the proposed strategy. 相似文献
39.
40.
Neji Gharsallah Lamia Khannous Nabil Souissi Moncef Nasri 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2002,77(8):865-870
Wastewaters generated by a factory processing marine products are characterized by high concentrations of organic compounds and salt constituents (>30 g dm?3). Biological treatment of these saline wastewaters in conventional systems usually results in low chemical oxygen demand (COD) removal efficiency, because of the plasmolysis of the organisms. In order to overcome this problem a specific flora was adapted to the wastewater from the fish‐processing industry by a gradual increase in salt concentrations. Biological treatment of this effluent was then studied in a continuous fixed biofilm reactor. Experiments were conducted at different organic loading rates (OLR), varying from 250 to 1000 mg COD dm?3 day?1. Under low OLR (250 mg COD dm?3 day?1), COD and total organic carbon (TOC) removal efficiencies were 92.5 and 95.4%, respectively. Thereafter, fluctuations in COD and TOC were observed during the experiment, provoked by the progressive increase of OLR and the nature of the wastewater introduced. High COD (87%) and TOC (99%) removal efficiencies were obtained at 1000 mg COD dm?3 day?1. © 2002 Society of Chemical Industry 相似文献