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Partager le résultat de cette recherche Interroger des sources externesEtude des méthodes d'évaluation et d'inhibition du pouvoir incrustant des eaux dures / Hadda Semine ras
Titre : Etude des méthodes d'évaluation et d'inhibition du pouvoir incrustant des eaux dures Type de document : texte imprimé Auteurs : Hadda Semine ras, Auteur ; Samira Ghizellaoui, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 218 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Entartrage CaCO3 inhibition K2HPO4 K 3PO4 tripolyphosphates (STTP) chronoampérométrie chronoélectrogravimétrie impédancemétrie PCR RX Raman Scaling K3PO4 chroamperometry chronoelectrogravimetry impedancemetry FCP ???? ??????? ????????? ????? STTP K2HPO4????????????????
?????????????? ???????? ?????????????? ??????? ?????? ??????? ?????? ??????? ??? ?????Index. décimale : 540 Chimie et sciences connexes Résumé : The precipitation of an insulating layer of calcium carbonate on the walls of the water distribution of Hamma and Fourchi have serious consequences technique and economic , reduced heat transfer in heat exchangers, limit the efficiency of these devices (valves and taps) by decreasing the flow rate in the pipes.
The objective of this study is the inhibition of the scaling capacity of domestic and industrial hard water for Hamma and Fourchi in the presence of K2HPO4 and K3PO4 and STTP. Various processes (electrochemical and chemical) are used.
The study of the evaluation of the encrusting power of its waters was carried out by means of chronoamperometry which is based on the reduction of dissolved oxygen and showed that these waters are very scaling. To combat hard water scaling, we have shown that it is sufficient to add low concentrations of inhibitors (K2HPO4, K3PO4, Polyphosphates) in order to obtain a total inhibition of the precipitation of the calcium carbonate.
It is possible to determine by the chronoelectrogravimetric (depending on the mass of the calcium carbonate as a function of time) the amount of inhibitor to be added in order to obtain the total inhibition of the calcium carbonate deposition. K2HPO4, K3PO4 and tripolyphosphates (STTP) appear as inhibitors particularly well suited to hard waters.
Electrochemical Impedance Spectroscopy (EIS) is used to characterize the adhesion and compactness of calcium carbonate deposition on a metal surface by measuring the high frequency resistance (Rhf) and the high frequency capacitance (Chf).
The addition of the three inhibitors (K2HPO4, K3PO4 and tripolyphosphates STTP) resulted in a decrease in high frequency resistance and the high frequency capacity increased. This reflects the porous nature of the deposit and the effectiveness of the scaling inhibitors K2HPO4 and K3PO4 and tripolyphosphates STTP.
The Fast Controlled Precipitation test (FCP) developed by LEDION et al. (1997), in the presence of K2HPO4, K3PO4 and tripolyphosphate (STTP) at low concentrations, delayed precipitation of calcium carbonate.
The analysis of calcium carbonate deposition by (RX, Raman) changes the morphology of calcite in raw water to a mixture of (calcite, vaterite and aragonite). Among the inhibitors studied, STTP remains the best inhibitor because it acts at a very low concentration by blocking the (germination-growth) of calcium carbonate.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/SEM7263.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10860 Etude des méthodes d'évaluation et d'inhibition du pouvoir incrustant des eaux dures [texte imprimé] / Hadda Semine ras, Auteur ; Samira Ghizellaoui, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 218 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Entartrage CaCO3 inhibition K2HPO4 K 3PO4 tripolyphosphates (STTP) chronoampérométrie chronoélectrogravimétrie impédancemétrie PCR RX Raman Scaling K3PO4 chroamperometry chronoelectrogravimetry impedancemetry FCP ???? ??????? ????????? ????? STTP K2HPO4????????????????
?????????????? ???????? ?????????????? ??????? ?????? ??????? ?????? ??????? ??? ?????Index. décimale : 540 Chimie et sciences connexes Résumé : The precipitation of an insulating layer of calcium carbonate on the walls of the water distribution of Hamma and Fourchi have serious consequences technique and economic , reduced heat transfer in heat exchangers, limit the efficiency of these devices (valves and taps) by decreasing the flow rate in the pipes.
The objective of this study is the inhibition of the scaling capacity of domestic and industrial hard water for Hamma and Fourchi in the presence of K2HPO4 and K3PO4 and STTP. Various processes (electrochemical and chemical) are used.
The study of the evaluation of the encrusting power of its waters was carried out by means of chronoamperometry which is based on the reduction of dissolved oxygen and showed that these waters are very scaling. To combat hard water scaling, we have shown that it is sufficient to add low concentrations of inhibitors (K2HPO4, K3PO4, Polyphosphates) in order to obtain a total inhibition of the precipitation of the calcium carbonate.
It is possible to determine by the chronoelectrogravimetric (depending on the mass of the calcium carbonate as a function of time) the amount of inhibitor to be added in order to obtain the total inhibition of the calcium carbonate deposition. K2HPO4, K3PO4 and tripolyphosphates (STTP) appear as inhibitors particularly well suited to hard waters.
Electrochemical Impedance Spectroscopy (EIS) is used to characterize the adhesion and compactness of calcium carbonate deposition on a metal surface by measuring the high frequency resistance (Rhf) and the high frequency capacitance (Chf).
The addition of the three inhibitors (K2HPO4, K3PO4 and tripolyphosphates STTP) resulted in a decrease in high frequency resistance and the high frequency capacity increased. This reflects the porous nature of the deposit and the effectiveness of the scaling inhibitors K2HPO4 and K3PO4 and tripolyphosphates STTP.
The Fast Controlled Precipitation test (FCP) developed by LEDION et al. (1997), in the presence of K2HPO4, K3PO4 and tripolyphosphate (STTP) at low concentrations, delayed precipitation of calcium carbonate.
The analysis of calcium carbonate deposition by (RX, Raman) changes the morphology of calcite in raw water to a mixture of (calcite, vaterite and aragonite). Among the inhibitors studied, STTP remains the best inhibitor because it acts at a very low concentration by blocking the (germination-growth) of calcium carbonate.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/SEM7263.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10860 Exemplaires
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Titre : Caractérisation structurale et optique De nanocristaux de ZnO Type de document : texte imprimé Auteurs : Abdelghani Bouabdallah, Auteur ; Abderrahmane Chaieb, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2013 Importance : 62 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Tags : Nano composite PMMA / ZnO les rayons X RX absorption optique émission optique- methode soi-gel spin coating X-rays X-ray optical absorption optical emission - so- gel method ???????? ?????? ???????? ?????????? ????? ???-???- RX ?????? ??????? PMMA/ZNO ????? ???? ?????? Index. décimale : 530 Physique Résumé : This work to study the structural and optical ZnO nanocrystals
For the preparation of nano- zinc oxide was confused by Material:
LaCetate Zinc dihydrate , citric acid
For the preparation of nano ZnO by material : Zinc LaCetate dihydrate , citric acid
For the preparation of thin film nano composite material was :
, The nano ZnO powder , THF ( tetrahydrofuran ) , the léthanol PMMA After preparing thin layer were placed under a UV radiation Structural study of this course are made by thin film X-ray diffraction to determine the size of nanoscale crystals ZNO
Preliminary study using the optical absorption in the UV range of the following thin film showed absorption edge shift to higher energies and this is due to the small size of the nanocrystals ZNO The study by the program that the samples his boots intense emission in the , emission of visible and near UV makes this material prepared from the elements eligible for the use of applications in the field of optical and electrical .Diplôme : Magistère En ligne : ../theses/physique/BOU6464.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9502 Caractérisation structurale et optique De nanocristaux de ZnO [texte imprimé] / Abdelghani Bouabdallah, Auteur ; Abderrahmane Chaieb, Directeur de thèse . - constantine (Route ain el bey, Algérie) : Université Constantine 1, 2013 . - 62 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Nano composite PMMA / ZnO les rayons X RX absorption optique émission optique- methode soi-gel spin coating X-rays X-ray optical absorption optical emission - so- gel method ???????? ?????? ???????? ?????????? ????? ???-???- RX ?????? ??????? PMMA/ZNO ????? ???? ?????? Index. décimale : 530 Physique Résumé : This work to study the structural and optical ZnO nanocrystals
For the preparation of nano- zinc oxide was confused by Material:
LaCetate Zinc dihydrate , citric acid
For the preparation of nano ZnO by material : Zinc LaCetate dihydrate , citric acid
For the preparation of thin film nano composite material was :
, The nano ZnO powder , THF ( tetrahydrofuran ) , the léthanol PMMA After preparing thin layer were placed under a UV radiation Structural study of this course are made by thin film X-ray diffraction to determine the size of nanoscale crystals ZNO
Preliminary study using the optical absorption in the UV range of the following thin film showed absorption edge shift to higher energies and this is due to the small size of the nanocrystals ZNO The study by the program that the samples his boots intense emission in the , emission of visible and near UV makes this material prepared from the elements eligible for the use of applications in the field of optical and electrical .Diplôme : Magistère En ligne : ../theses/physique/BOU6464.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9502 Exemplaires
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Titre : Synthèse, réactivité et étude structurale des complexes organométallocarbonyles mononucléaires, marqueurs de molécules biologiquement actives Type de document : texte imprimé Auteurs : Salah Merniz, Auteur ; M. Mokhtari, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2015 Importance : 105 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Complexes fer carbonyle Marquage Activité antibactérienne FT-IR RX Carbonyl Iron complexes labelling Antibacterial activity ???? ?????? ?????????? ???? ?????? ?????????? Index. décimale : 540 Chimie et sciences connexes Résumé : The objective of this work is the use of the organometallo-carbonyl as biological molecules markers. In fact, such molecules marked constitute easily detectable probes using IR spectroscopy because of the specific signals associated with the carbonyls ligands related to metal in the 1800-2200 cm-1 region.
In this domain, our contribution consists of the preparation and the structural study of new tricarbonyles iron obtained by covalent coupling between the cation [tricarbonyl (1-5-h- cyclohexa-1,3-diene) iron] tetrafluoroborate and the three biologically active molecules : the N-acetyl histamine, the imidazolidine-2-thione and the 2-aminothiazole. The labeled complexes have been purified and characterized by the spectroscopically (IR, RMN 1H)
methods.
Three complexes structure [Tricarbonyl (1-4-h–5- N-acetyl histaminio cyclohexa-1,3- diene) iron] 2, [Tricarbonyl (1-4-h-5-N-imidazolidinio-2-thione cyclohexa-1,3-diene) iron] 3 and [Tricarbonyl (1-4-h–5-N-2-aminothiazolio cyclohexa-1,3-diene) iron] 4 have been determined by X-ray crystallography revealing the exo enantiomer existence for 2 and for 4
and for dimer 3.
The biological activity of two free ligands imidazolidine-2-thione and the 2- aminothiazole showed an important antibacterial activity .After labeling them (3 and 4 respectively), this activity has decreased for the complex 3 and increased for the complex 4.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/MER6682.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9945 Synthèse, réactivité et étude structurale des complexes organométallocarbonyles mononucléaires, marqueurs de molécules biologiquement actives [texte imprimé] / Salah Merniz, Auteur ; M. Mokhtari, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2015 . - 105 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Complexes fer carbonyle Marquage Activité antibactérienne FT-IR RX Carbonyl Iron complexes labelling Antibacterial activity ???? ?????? ?????????? ???? ?????? ?????????? Index. décimale : 540 Chimie et sciences connexes Résumé : The objective of this work is the use of the organometallo-carbonyl as biological molecules markers. In fact, such molecules marked constitute easily detectable probes using IR spectroscopy because of the specific signals associated with the carbonyls ligands related to metal in the 1800-2200 cm-1 region.
In this domain, our contribution consists of the preparation and the structural study of new tricarbonyles iron obtained by covalent coupling between the cation [tricarbonyl (1-5-h- cyclohexa-1,3-diene) iron] tetrafluoroborate and the three biologically active molecules : the N-acetyl histamine, the imidazolidine-2-thione and the 2-aminothiazole. The labeled complexes have been purified and characterized by the spectroscopically (IR, RMN 1H)
methods.
Three complexes structure [Tricarbonyl (1-4-h–5- N-acetyl histaminio cyclohexa-1,3- diene) iron] 2, [Tricarbonyl (1-4-h-5-N-imidazolidinio-2-thione cyclohexa-1,3-diene) iron] 3 and [Tricarbonyl (1-4-h–5-N-2-aminothiazolio cyclohexa-1,3-diene) iron] 4 have been determined by X-ray crystallography revealing the exo enantiomer existence for 2 and for 4
and for dimer 3.
The biological activity of two free ligands imidazolidine-2-thione and the 2- aminothiazole showed an important antibacterial activity .After labeling them (3 and 4 respectively), this activity has decreased for the complex 3 and increased for the complex 4.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/MER6682.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9945 Exemplaires
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