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Refrigerator Coupling to a Water-Heater and Heating Floor to Save Energy and to Reduce Carbon Emissions

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Computational Water, Energy, and Environmental Engineering 2013年第1期2卷 21-29页

作者： romdhane ben slama ISSAT Gabes Rue Omar Ibn Khattab Gabes Tunisia

With an aim of rationing use of energy, energy safety, and to reduce carbon emission, our interest was geared towards the refrigerators and all the refrigerating machines. Indeed the heat yielded by the exchanger condenser can be developed for the water heating, floors heating etc. After an encouraging theoretical study, two prototypes were produced in order to validate the theoretical results. A first refrigerator was coupled with a water-heater and another with a heating floor. The water temperature reached, in one day, is of 60℃;which makes it possible to predict better results with a continuously used refrigerator. In the same way for the heating floor coupled with the second refrigerator, the temperature reached high values because the surface is reduced;however for the heating floors the standard fixes the temperature between 28℃ and 30℃.

关键词： Refrigerator Recuperator Heating Water Heating Floor Heat Pump

Hydrogen Production by Water Electrolysis Effects of the Electrodes Materials Nature on the Solar Water Electrolysis Performances

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Natural Resources 2013年第1期4卷 1-7页

作者： romdhane ben slama Unit of Research: Environment Catalysis & Processes Analysis National School of Engineers of Gabes University of Gabes Gabes Tunisia

Our contribution in the production of hydrogen, vector of energy, consists in testing the water electrolysis by photovoltaic solar energy. The realization of some electrolysers whose electrodes are various materials, showed a clear difference from the point of view produced hydrogen flow, conversion efficiency, energy specific consumption and the electrodes lifespan. This made it possible to classify materials, by performances descending order, as follows: copper, lead, bronzes, aluminum, stainless, graphite and steel. However lead has a too low flow and aluminum corrodes quickly. Steel admits poor yield and lifespan. Then, we retain primarily copper like anode metal. To increase the hydrogen produced flow by electrolysis, the electrolysers parallel assembly choice is essential. According to the hour of the day, the evolution of the parameters such as consumed current, efficiency, and specific energy differs from a material with another, which can be explained by the variation of solar energy during the day.

关键词： Hydrogen Electrolysis Photovoltaic Electrodes Corrosion

Experimentation of a Plane Solar Integrated Collector Storage Water Heater

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Energy and Power Engineering 2012年第2期4卷 67-76页

作者： romdhane ben slama Research Unit Environment Catalysis and Analysis of Processes National School of Engineers of Gabès (E.N.I.G) University of Gabès Medenine Tunisia

In order to popularize the use of the solar-water heaters, especially in the residential and tertiary sectors with the third world, it appears to be necessary to reduce their cost while improving their performances. It is the object of this integrated storage collector thus created and tested in the south of Tunisia. It is simply made up of a tank playing the double part of solar absorber and storage tank of warm water, of a glazing to profit from the greenhouse effect and of an insulating case. Its measured energy performances, by the method of input-output proves its effectiveness to produce hot water, in spite of its simplicity of manufacture, usage and maintenance. Indeed a temperature of water exceeding 70?C is reached towards the afternoon True Solar Time, and for an efficiency of 7%. Thus, this type of collector with integrated storage is entirely satisfactory and could be available to larger mass.

关键词： Heating of Water Solar Energy Storage Collector Tests

Production of Hydrogen by Electrolysis of Water: Effects of the Electrolyte Type on the Electrolysis Performances

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Computational Water, Energy, and Environmental Engineering 2013年第2期2卷 54-58页

作者： romdhane ben slama Higher Institute of Applied Sciences and Technology University of Gabes Gabes Tunisia

The production of hydrogen, vector of energy, by electrolysis way and by using photovoltaic solar energy can be optimized by suitable choice of electrolytes. Distilled water, usually used, due to membrane presence may be substituted by wastewaters, which enters more in their treatment. Waste water such as those of the Cleansing National Office, and also of the factories such as those referring with ammonia, the margines, and even urines that make it possible to produce much more hydrogen as distilled or salted water, more especially as they do not even require an additive or membranes: conventional electrolysers with two electrodes. This study seeks to optimize the choice among waste water and this, by electrolysis in laboratory or over the sun according to produced hydrogen flow criteria, electrolysis efficiency and electric power consumption. The additive used is NaCl. The most significant results are on the one hand the significant increase in the produced hydrogen flow by the addition of the additive;on the other hand the advantage of gas liquor and urine compared to the others tested electrolytes.

关键词： Hydrogen Production Electrolysis Electrolyte Photovoltaic

Global Warming and Its Multiple Causes

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Journal of Atmospheric Science Research 2020年第2期3卷 28-31页

作者： romdhane ben slama Higher Institute of Applied Sciences and Technology of Gabes(ISSAT) University of GabesTunisia

The global warming which preoccupies humanity,is still considered to be linked to a single cause which is the emission of greenhouse gases,CO2 in *** this article,we try to show that,on the one hand,the greenhouse effect(the radiative imprisonment to use the scientific term)took place in conjunction with the infrared radiation emitted by the *** surplus of CO2 due to the combustion of fossil fuels,but also the surplus of infrared emissions from artificialized soils contribute together or each separately,to the imbalance of the natural greenhouse effect and the trend of global *** addition,another actor acting directly and instantaneously on the warming of the ambient air is the heat released by fossil fuels estimated at 17415.1010 kWh/year inducing a rise in temperature of 0.122°C,or 12.2°C/century.

关键词： Greenhouse effect gases Global warming Infrared emission Heat of combustion

Experimentation of a Plane Solar Integrated Collector Storage Water Heater

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An Efficient Two-Phase Model for Computing Influential Nodes in Social Networks Using Social Actions

Energy and Power Engineering 2012年第2期

作者： romdhane ben slama

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Journal of Computer Science & Technology 2018年第2期33卷 286-304页

作者： Mehdi Azaouzi Lotfi ben romdhane Modeling of Automated Reasoning Systems Research Laboratory LR17ES05 Higher Institute of Computer Science and Telecom University of Sousse Sousse 526-~002 Tunisia

The measurement of influence in social networks has received a lot of attention in the data mining community. Influence maximization refers to the process of finding influential users who make the most of information or product adoption. In real settings, the influence of a user in a social network can be modeled by the set of actions （e.g., ＂like＂, ＂share＂, ＂retweet＂, ＂comment＂） performed by other users of the network on his/her publications. To the best of our knowledge, all proposed models in the literature treat these actions equally. However, it is obvious that a ＂like＂ of a publication means less influence than a ＂share＂ of the same publication. This suggests that each action has its own level of influence （or importance）. In this paper, we propose a model （called Social Action-Based Influence Maximization Model, SAIM） for influence maximization in social networks. In SAIM, actions are not considered equally in measuring the ＂influence power＂ of an individual, and it is composed of two major steps. In the first step, we compute the influence power of each individual in the social network. This influence power is computed from user actions using PageRank. At the end of this step, we get a weighted social network in which each node is labeled by its influence power. In the second step of SAIM, we compute an optimal set of influential nodes using a new concept named ＂influence-BFS tree＂. Experiments conducted on large-scale real-world and synthetic social networks reveal the good performance of our model SAIM in computing, in acceptable time scales, a minimal set of influential nodes allowing the maximum spreading of information.

关键词： social network social influence social action personalized PageRank influence-BFS tree

Adaptive Terminal Sliding Mode Control for Rigid Robotic Manipulators

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International Journal of Automation and computing 2011年第2期8卷 215-220页

作者： Mezghani ben romdhane Neila Damak Tarak Industrial Processes Control Unit National Engineering School of SfaxUniversity of Sfax

In order to apply the terminal sliding mode control to robot manipulators,prior knowledge of the exact upper bound of parameter uncertainties,and external disturbances is ***,this bound will not be easily determined because of the complexity and unpredictability of the structure of uncertainties in the dynamics of the *** resolve this problem in robot control,we propose a new robust adaptive terminal sliding mode control for tracking problems in robotic *** applying this adaptive controller,prior knowledge is not required because the controller is able to estimate the upper bound of uncertainties and ***,the proposed controller can eliminate the chattering effect without losing the robustness *** stability of the control algorithm can be easily verified by using Lyapunov *** proposed controller is tested in simulation on a two-degree-of-freedom robot to prove its effectiveness.

关键词： Terminal sliding mode sliding mode control adaptive control of robot robust control Lyapunov method.

Valorization of harbor dredged sediment activated with blast furnace slag in road layers

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International Journal of Sediment Research 2021年第1期36卷 127-135页

作者： Abdelwaheb ben slama Nesma Feki Daniel Levacher Moncef Zairi Laboratory “Water Energy and Environment” (LR3E) National Engineering School of Sfax Faculty of Science University of Sfax University of Caen-Normandie

The valorization solutions for dredged sediment have been the subject of a great number of investigations over the previous *** the current present study,treatment of polluted dredged sediment for the commercial port of Sfax,Tunisia,is *** industrial byproduct(blast furnace slag) was used to bind raw sediment for a reuse in road *** standards of this field,the raw sediment first was identified and classified according to the French technical *** an environmental assessment was applied due to the presence of heavy *** concentrations were measured on the raw sediment particles so as to control the binding effect on heavy *** mixtures consisted of a mix of sand and a blast furnace slag activated with *** mixtures were tested and some were proposed for sub-layer *** Sfax commercial port raw sediment is considered as a sandy loam with a very low fraction of *** measured concentrations of heavy metals exceed the recommended thresholds for cadmium,copper,lead,and *** can induce hazardous effects in the case of their dumping into the *** the other hand,the concentrations of the detected elements after leaching tests run on raw sediment samples are very low compared to the thresholds;such results highlight a possible recycling of the raw sediment in subgrade layers without any negative *** formulations were deduced for road engineering tests relying on the ratio the California Bearing Ratio index and the immediate bearing *** the obtained ratio exceeds one,the treated sediment can be recycled and used in road layers.

关键词： Sediment Sfax commercial port Blast furnace slag Valorization Road layers Bearing capacity