für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This work has been carried out to investigate thecatalytic activity of some Schiff Base complexes incyclopropanation of non-activated olefins. Ten newSchiff base ligands were prepared (three diamines andseven thiosemicarbazones) and Characterized byelemental analyses and spectral studies (IR, NMR, UVand mass spectroscopy). One of the prepared diamineligands was optically active. Moreover, sometransition metal complexes of these ligands wereprepared by the reaction of the transition metal ionswith these new ligands, and characterized byelemental analyses, spectrophotometric studies (IR,NMR, ESR and UV-Vis.), molar conductivity andmagnetic moment determinations beside ESRmeasurements to enable the elucidation of thegeometrical structure of the prepared metalcomplexes. The results came with good agreement withthe proposed structures. Some of the prepared copperand cobalt complexes were investigated for theircatalytic activity in cyclopropanation ofnon-activated olefins and some of them showed anexcellent reactivity with a moderate to excellentselectivity. Five of the examined copper complexescan be used as catalysts in industry. ····· 10361118172
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The synthesis and coordination chemistry of elevenbridging ligands, eight of which are new compounds,are described. These ligands are all based on thetridentate terpyridyl system. The other metal ionbinding sites of these ligands containpyridine/bipyridine/pyrazole rings oramine/azamacrocycles domains. In these ligands, thetwo metal ion binding sites are differentiated by thenumber of atoms in each site, the configuration ofthe binding site or the types of donor atom that arepresent. Many of the complexes synthesized aremono-ruthenium(II) complexes where Ru(II) ions aresituated in the terpyridyl sites of the ligands.These include heteroleptic Ru(II) complexes of thetype [Ru(ttp)(L)]2+, where ttp is4`-(p-tolyl)-2,2`:6`,2`-terpyridine, and L is thebridging ligand. A combination of NMR spectroscopy,ESI-MS, UV-vis spectroscopy, elemental analysis, andX-ray crystallography has been used to characterizethe ligands and their complexes. The crystalstructures of one new ligand and sixteen complexesare described. ····· 10361118124
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Understanding of oxorhenium(V) Rhenium(V) complexes as radiopharmaceuticals for therapy and diagnosis have received attention, because of their suitable radionuclear properties, i.e., 186Re: Emax = 1.1 MeV for beta-emission and Emax = 0.137 MeV for gamma-emission with t1/2 = 90.6 h, 188Re: Emax = 2.1 MeV for beta-emission and Emax = 0.155 MeV for gamma-emission with t1/2 = 17 h. Hence, chemical properties of various monooxo- and dioxorhenium(V) (ReO3+ and ReO2+) complexes have been examined as basic studies for their application to radiopharmaceutical. However, only limited information is available concerning the electrochemical properties and stereoisomerism of oxorhenium(V) complexes in non-aqueous solutions, in spite of importance in the relation to in vivo behavior, i.e., the reactivity towards redox agents. This book is covering a doctoral study and its results on the related subjects. ····· 10361118100
für 62.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray En esta tesis se describe la síntesis y caracterización de una familia de ligandos orgánicos (N-pirazol, O-alcohol y N-pirazol, O-éter), y su utilización en la síntesis de complejos con diferentes metales de transición, preferentemente Pd(II), pero también con otros metales tanto del Grupo 10 como del Grupo 12 de la Tabla Periódica. También se ha ensayado la capacidad catalítica de algunos de los complejos de Pd(II) en la reacción de Heck, y la capacidad de los ligandos N-pirazol, O-éter en la síntesis y estabilización de nanopartículas.En total se han sintetizado un total de 22 complejos. La caracterización de los complejos se ha hecho utilizando diferentes técnicas: Análisis elementales, Medidas de conductividad, Espectrometría de masas, Espectroscopía de IR, RMN (unidimensionales, bidimensionales) y por difracción de rayos-X en monocristal siempre que ha sido posible además de medidas de fluorescencia para algunos complejos. ····· 10361116814
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Anglo Platinum currently stores some of its recovered osmium as the relatively stable potassium osmate salt and ruthenium in the form of ammonium hexachlororuthenate or an acidic ruthenium solution at its refinery plant. To date the development of the chemistry of these starting materials to provide useful inorganic and organometallic precursors has not been extensively reported. This is partly due to the relative cost of osmium starting materials and the inertness of most osmium complexes and also the toxicity of osmium tetroxide. Most known ruthenium compounds are usually made from ruthenium trichloride trihydrate.In the present project locally available refinery materials have been converted into a range of known osmium and ruthenium compounds including clusters together with the well known Grubbs` catalyst starting material as well as other useful complexes. The development of the synthesis of convenient osmium and ruthenium precursors as well as potential catalysts has been proven to be possible based on standard (literature) synthetic methods using the Anglo Platinum refinery material. Some procedures are new and some are modified literature procedures. ····· 10361116007
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The coordination chemistry of hydrazones is an intensive area of study and numerous transition metal complexes of these ligands have been investigated, which stemmed from the interest in the biological and pharmacological properties of these hydrazones. It is also known that mono and bis-hydrazones find wide applications in medicine as active physiological preparations, due to their antibacterial, tuberculostatic, fungicdal properties as well as activities against certain types of cancers and microorganisms. Further more benzothiazole and its derivatives constitute an important class of compounds having a wide spectrum of biological activity. ····· 10361115927
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Chemistry, the branch of science, deals nearly with every phase of our life. Nobody can deny its importance and applications in daily life. Chemistry is the practical subject, therefore, it is necessary that students must have a crystal clear understanding of practicals conducting in laboratories. Here an attempt has been adopted to train the young chemists to direct their approach towards the desired task easily.The book contains the basic first hand knowledge for undergraduate students. The book has been organized into three parts Introduction,qualitative analysis, Synthesis and Bio-chemical tests. ····· 10361115611
für 35.91€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Summarizes the preparation and structure characterization of various thiosemicarbazones attached Quinoline aldehyde as well as their metal complexes. Synthesized ligands and metal complexes were characterized by different technique like mass, IR, 1H NMR, 13C NMR, UV-Visible spectroscopy as well as elemental analysis. In the elemental analysis of the synthesized compound both calculated and found percentages of elements are matched so elemental analysis confirms the structure of the thiosemicarbazone. Mass spectral data confirm the structure of the ligand as indicated by the molecular ion peak (M+) corresponding to their molecular weight. In IR spectra of the synthesized thiosemicarbazone showed useful information about the structure of the compound. In the IR spectra, some significant stretching bands due to -N-H, -N-N-, -NH2 and -C=S were observed at specific frequencies. In the 1H NMR spectra, the signal due to -CH=N-, -N-NH, NH2 and aromatic protons were observed in the expected regions. The 13C NMR spectrum provides direct information about the carbon skeleton of the synthesized compound. ····· 10361115049
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Regulations concerning automotive emissions are becoming more stringent in recent times and consequently more research efforts have directed toward lowering the environmental impact of pollutants emitted by vehicles and industries. In this context, the research focus has been aimed at the development of more efficient and highly resistant catalytic materials which could be able to maintain maximum durability while decreasing pollutant emissions to minimum levels. Three-way catalysts (TWCs) constitute the most satisfactory and efficient solution to reduce pollutant emissions from gasoline-engine-powered vehicles. This book which is based on a comprehensive research study gives an insight on the development of novel nanosized cerium oxide based catalysts for TWC and other catalytic applications. It contributes invaluable information on how catalysts composition can be manipulated for better performance. This book will be especially useful to researchers working in the field of catalysts development, catalyst`s structural analysis, environmental catalysis, and more specifically in the area nanocatalysis. ····· 10361114641
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Steel quality depends on various factors, i.a. on the slag basicity and oxidation potential. These values can be determined by means of emf measurement using solid electrolyte based sensors. Liquid iron can serve as a cation electrode. Activity of ferrous oxide and manganese oxide can be found out. Ferrous oxide activity determines the oxidation potential and manganese oxide activity can be used for the basicity estimation. Sulphide and phosphate capacity can be calculated and distribution coefficients of oxygen, sulphur, manganese, and other elements can be predicted. Metallurgical wastes are classified as hazardous because of high content of heavy metals and their waste disposal is problematic. Their hydrometallurgical recycling is difficult due to poorly soluble zinc ferrite. Thermal treatment is expensive because of high energy consumption. A new method of acid leaching applying diluted acids was developed. Entire zinc from the ferritic wastes can be extracted. A solid residue is hematite. The present study should be useful for research workers dealing with thermodynamics of melts and waste treatment. ····· 10361114337
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This work describes the physico-chemical studies of metal complexes with N and S donor ligands. Emphasis has been given to the synthesis and characterization of polyazamacrocycles and dithiocarbamato complexes of transition metal ions and Sn(IV). They have been characterized by FT-IR, NMR (1H, 13C and 119Sn), mass spectrometry and X-ray crystallography. The synthesis of 14-membered hexaaza macrocyclic complexes of the type [CuL]X2, [CuL1]X2, [CuL(N3)(ClO4).3/2O]n, [CuL(N3)2] and [CuL1(N3)(ClO4)]n was reported. The effect of anions on the gross geometry and chemical properties of the Cu(II) ion have been studied. The crystal structure of [Ni(L)][CoCl4] clearly establishes the cationic-anionic interaction. Rare C H---Ni anagostic interactions, generally exhibited by d8 complexes also observed. The interaction of potassium bis(2,2-dithiopiperazinato-2,2-diaminodiethylamine (K2L) with R2SnCl2 leading to the formation of bimetallic complexes of the type R4Sn2L2 have been reported. The synthesis of a mononuclear precursor complex, [(CH3)2Sn(tpdtc)] and several heterobimetallic derivatives of the type, [(CH3)2Sn(tpdtc)]MCl2 have also been reported. ····· 10361114097
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Shorttitle Humic Acid (HA) is an important constituent of soil organic matter which was the subject of several environmental studies. In this work the adsorption isotherms of Thorium(IV) and Uranium(VI) onto Azraq Humic acid (AZHA) were studied at different temperature and pH values. The results indicate that Thorium(IV) has higher adsorptivity than Uranium(VI). The increasing of pH resulted in higher adsorptivity of Actinides. In contrast to heavy metals and Lanthanides (entropy driven), the adsorption of Actinides on HA was found to be exothermic and so enthalpy driven. This leads to the hypothesis that Thorium(IV) and Uranium(IV) are encapsulated in the interior of HA helix with their water of hydration because the interior is full with water. However, heavy metals and Lanthanides are adsorbed on the exterior of HA helix. ····· 10361113940
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book presents the results for the physical and chemical characterisation of co-disposal precipitates prepared from the co-disposal of acid mine drainage and fly ash. The prepared high capacity ion exchange adsorbents were characterised using fundamental characterisation tools such as X-ray Diffraction Spectrometry (XRD), X-ray Fluorescence Spectrometry (XRF), Scanning Electron Microscopy (SEM), Inductively Coupled Plasma Mass Spectrometry (ICP-MS), Fourier Transformed Infrared Spectrometry (FTIR) and Cation Exchange Capacity (CEC). The prepared zeolitic material were also applied in toxic element removal experiments, to assess its ability to reduce the concentrations of some heavy metal ions in wastewater. ····· 10361113914
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The synthesis, structural characterization and reactivity of transition metal phenoxides is rapidly expanding field of study. The phenoxide ion is an important ligand in inorganic chemistry because it provides not only a strong metal-oxygen bond but a flexible organic moiety having an advantage over analogous alkoxide ligands in that electronic properties can easily be varied by changing the substituents in the phenyl ring and steric effects in close proximity to metal can be modified by varying the bulk of substituents at ortho and para positions of the ring. Recent research in the field of metal aryloxides has grown rapidly not only because of their structural properties but also due to their potential applications . This book is divided into four chapters. Each chapter covers different aspects of mixed ligand complexes of zirconium like synthesis, characterization, reactivity, thermal analysis etc. this book is intended to give insight into transition metal phenoxides especially zirconium(IV) and is helpful for students/ researchers who want to pursue research in the area of transition metal chemistry land thermal analysis. ····· 10361113405
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Firing of agricultural residues to produce heat energy leads to char production which is the firing residues. This char is a mixture of unburnt carbon, some metallic oxides and silicon dioxide. While the amount of silicon dioxide present in the char is dependent upon the type of the agricultural residue, the amount of unburnt carbon is determined by air availability and firing temperature. The char remained after firing agricultural residues can be used as a thermal insulation for steel works, constructive material for cement, ceramics,brick use and as a fertilizer for cultivated land use. Also it can be used after some treatment processes as a bonding agent and detergent use for reinforced plastic and rubber use as well as for medicine / food industry use. This research is conducted to utilize silica present in this char for preparing calcium silicate hydrate (CSH) which can be used as an adsorbent either alone or with the unburnt carbon present in the char to remove iron and manganese and other metallic ions from water. ····· 10361113339
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Advanced oxidation technologies (AOT) have been developed for the detoxification of water contaminated with persistent organic chemicals. The method utilizing the strong oxidizing potential of the hydroxyl radical has proven effective and promising technologies which aim at the decolorization and mineralization of a wide range of contaminants including dyes. The strategies for generating the reactive hydroxyl radical ( OH) for these oxidation methods include UV photolysis of hydrogen peroxide (UV/H2O2), Fenton (Fe(+n)/H2O2) or photo-Fenton type reactions (UV/Fe(+n)/H2O2). Usually Fenton or photo-Fenton reaction used to enhancement the production of OH radicals through the inter- reaction of hydrogen peroxide with Fe+n salts. A cheap source of Fen+ such as zero valent iron (ZVI) powder Fe(0) may be used in the photo-Fenton reaction. Furthermore, application of nanotechnology for the preparation of nanoparticles zero valent iron (NZVI) powder would lead to enhancement the properties of Fe0 powder.One of the main objectives of this study was to prepare iron nanoparticles powder and to investigate its effect on the photodegradation process. ····· 10361113315
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Applications Transition metal complexes of acylhydrazones and related N, O donor Schiff bases and their metal complexes have attracted considerable attention during recent years because of their applications in several bio-chemical, industrial and analytical processes. Some of the applications of these compounds are mentioned below: As biological probes As optical devices As catalyst Mesogenic behavior As sensing material As DNA cleaving agents Super oxide dismutase-mimic activity In analytical processes Other uses The hydrazones have been used as plasticizers and stabilizers for polymers [Kuhn et al. (2001), Gupta et al. (2007)], polymerization initiators and antioxidants etc. Hydrazone compounds have the ability to control the release of volatile aldehydes and ketones [Levrand et al. (2006)]. The phenyl derivative Schiff bases have been used as corrosion inhibitors for aluminium in hydrochloric solution [Unaleroglu et al. (2001)]. It is apparent from the above applications that the selected field of transition metal complexes of N, O donor ligands is very useful and multi-dimensional. Each new ligand/ new complex or new study gives a new direction to the area of research. ····· 10361113100
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In recent years, interest in the preparation and characterization of the na-noporous materials has grown due to their distinctive properties and potential applications. Among them, silica aerogel are transparent, highly porous and lightest synthetic solids. Silica aerogels, prepared by sol-gel method followed by supercritical drying, have various extraordinary properties viz. low density (~20 mg/cm3) and thermal conductivity (0.05 W/mK), low sound velocity (~100 m/s) and large surface area ( 1500 m2/g). Due to this unique combination of properties, aerogels are considered as a new class solid state porous material having various scientific and technological applications like super insulating transparent fillers in double walled windows, catalytic supports, Cerenkov detectors, filters and containers for capturing of micrometeorites in space. However, economic large-scale industrial production of silica aerogels is hampered by expensive supercritical drying methods. The present book describes the results of detailed studies made on the synthesis and characterization of silica aerogels and related nano-porous materials by various methods and precursors at ambient pressure. ····· 10361113047
für 45.80€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Bis(phenolate) complexes of the early transition metals, such as titanium, are precatalysts for olefin polymerization. The ligand structure has a strong influence on the stereochemistry of the resulting polymer. For this reason, the bis(phenolate) ligands have been tuned by different substituents on the aromatic rings (R1 and R2) as well as by modifying the bridging unit. S atoms as part of the bridge can improve the catalytic activity, obviously as a result of hemilabile interactions. However, little is known about the bonding situation between the central metal and the ligands` sulfur atoms in these complexes. To clarify the bonding situation between these, according to the HSAB principle, mismatched atoms, bis(phenolato)titanium complexes as model compounds for active catalysts in the homogeneous olefin polymerization were synthesized and examined with high resolution Xray single crystal analysis. With the cyclohexyl bridged ligand a system was found which renders the base frame of the active catalysts. These model compounds do not comprise sterically demanding or disordering groups, which prevent a good resolution in single crystal X-ray analysis. It was possible to get high quality crystals of two different bis(phenolato)titanium complexes and one of the corresponding ligands. Furthermore a simplified cyclohexyl bridged salen ligand was used for complexation with titanium tetrachloride. The first crystal structure for dichlorido-N,N`-bis(salicylidene)-1,2cyclohexanediamino-titanium(IV) is reported here. Based on high-resolution data sets from the single crystal X-ray analysis, a multipole refinement based on the Hansen-Coppens multipole formalism was performed. The multipole refinement leads to an aspherical electron density, which enables the inspection of the bonding conditions in the molecule. With the aspherical electron density, a topological analysis of the bonding states was conducted. ····· 10361108178
für 11.40€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Dieses Buch behandelt in einer vorlesungsorientierten Darstellung die Nichtmetallchemie. An ein einführendes Kapitel zur Differenzierung zwischen Metallen und Nichtmetallen und ein Kapitel zum Element Wasserstoff schließt sich die Gliederung nach den Gruppen des Periodensystems an. Der Anfang wird mit den Edelgasen und ihren Verbindungen gemacht. Für eine kompakte Darstellung wurden Schwerpunkte gesetzt und eine Auswahl getroffen. Ein wichtiges Kriterium waren Anwendungen der Elemente und Verbindungen. Neben der Stoffchemie werden an geeigneten Stellen Theorien, Konzepte, Regeln vorgestellt. Im Rahmen der Stoffchemie sollen Trends und Querbeziehungen sichtbar gemacht werden. Das Buch setzt Kenntnisse in der Allgemeinen Chemie voraus. Atombau, Orbitalmodell, Aufbau des Periodensystems u.a. etwa werden hier nicht behandelt.Am Ende jedes Kapitels wird eine kurze Zusammenfassung gegeben, und es sind Fragen zur selbständigen Wissensüberprüfung formuliert. Beispiele für ausführlicher behandelte anwendungsbezogene Themengebiete sind: Wasserstoff als Energieträger, Chlorchemie, Ozon, Stickoxide, Organophosphor-Verbindungen, Treibhauseffekt, Silicone, Bor-Neutroneneinfang-Therapie. Die Umweltproblematik zu Chlor, Ozon, Schwefeldioxid, den Stickoxiden, Kohlenmonoxid und Kohlendioxid wird in breitem Rahmen angesprochen. Neben der Stoffchemie werden an geeigneten Stellen Theorien, Konzepte, Regeln vorgestellt. Beispiele für vorgestellte Konzepte sind: dreidimensionales Periodensystem, VSEPR-Modell, Molekülsymmetrie und Gruppentheorie, Molekülorbital-Theorie, isoelektronische Beziehungen, Wade-Regeln. Das Buch richtet sich an Studierende der Chemie vom 1. Semester bis zum Bachelor-Abschluss. Es vermittelt auf 272 Seiten ein solides (Prüfungs-)Wissen zur Nichtmetallchemie und ist zum Selbststudium geeignet. Das Erlernte kann anhand der Fragen am Ende jedes Kapitels überprüft werden. ····· 10361107578
····· lezzter Preis 49.80€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Die Kristallchemie von Seifen und Tensiden Seifen und Tenside sind auf Grund ihrer vielseitigen Einsatzmöglichkeiten als Detergentien und Zusatzstoffe sowohl aus unserem Alltag als auch aus der Industrie nicht mehr wegzudenken. Zusätzlich kommen Tenside in der Biochemie für die gezielte Synthese von Modellmembransystemen zum Einsatz. Infolgedessen besteht ein enormes wissenschaftliches wie auch industrielles Interesse an der Untersuchung ihrer Eigenschaften und ihres strukturchemischen Aufbaus. Im Rahmen dieser Arbeit lag der Forschungsfocus auf den Tensidklassen der Alkylsulfonate und der Alkylcarboxylate. Hierzu wurden folgende Verbindungen strukturchemisch charakterisiert und hinsichtlich ihrer supramolekularen Assoziationen und Eigenschaften im Festkörperverband sowie nach charakteristischen Aspekten, welche für einen möglichen Einsatz als Modellmembransystem sprechen, näher untersucht: Magnesiumethansulfonat-hexahydrat [(H2O)6Mg(C2H5SO3)2] Magensiumdecansulfonat-hexahydrat [(H2O)6Mg(C10H21SO3)2] Magnesiumdodecansulfonat-hexahydrat [(H2O)6Mg(C12H25SO3)2] Magnesiumoctadecansulfonat-hexaydrat [(H2O)6Mg(C18H37SO3)2] Calciumoctansulfonat-monohydrat [(H2O)Ca(C8H17SO3)2] Calciumnonansulfonat-diydrat [(H2O)2Ca(C9H19SO3)2] Calciumdecansulfonat [Ca(C10H21SO3)2] Lithiumoctadecanoat Li(C17H35COO) Natriumhydrogendioctadecanoat [Na(C17H35COO)(C17H35COOH)] Natriumoctadecanoat-hemihydrat [(H2O)Na(C17H35COO)2] Kaliumhydrogenbis(tridecanoat) [K(C12H25COO)(C12H25COOH)] Kaliumpentadecanoat K(C14H29COO) Kaliumheptadecanoat K(C16H33COO) Kaliumoctadecanoat K(C17H35COO) Calciumpropionat-monohydrat [(H2O)Ca(C2H5COO)2] Ferner konnten die Gitterparameter von Magnesiumoctadecanoat-dihydrat [(H2O)2Mg(C17H35COO)2] bestimmt werden. Zusammenfassend zeigen die vorliegenden Ergebnisse, dass die Kristallstrukturen von Seifen und Tensiden sowohl durch den anorganischen als auch durch den organischen Strukturteil des jeweiligen Tensidmoleküls bestimmt werden und dass diese Strukturteile charakteristische Aspekte aufweisen, die für einen Einsatz des Tensids als Modellmembransystem sprechen. ····· 10361107473
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The work present in this book deals with preparation and characterization of new complexes which contain some transition ions ( Sc3+, Ti3+, V5+, Cr3+, Mn2+, Fe3+, Co2+, Ni2+, and Cu2+) and non transition metal ions ( Ba2+, Ca2+, Zn2+, Cd2+, and Sn2+) with ligands ( Thymol, Vanillin, o,m,p-Cresol, Salicylic acid, Methyl salicylaste, Guaiacol, Eugenol, and Menthol). The prepared complexes subsequently tried as dental filling passing the required tests of color, pH, setting time, consistency, compressive strength, film thickness, microlekage, and antibacterial. The complex [ calcium-guaiacolate] show superiority in this respect and it is hoped that this complex (as dental filling) establish a chemical binding with the calcium of the tooth. ····· 10361103024
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Rice straw is an alternative source for the production of cellulose pulp and some other useful materials such as xanthated cellulose. The conditions of preparation (pulping, bleaching and xanthation) and factors affecting the main properties of the produced cellulose pulp and xanthated cellulose (the effect of alkali concentration, time of pulping and weight / volume ratio when boiling) are intended. The resulting intermediate products as well as the final products, were characterized and compared at each experimental step. The IR absorption spectral analysis were undertaken according to different methods (Saad et. al., base line technique, back ground and Pirlot methods) Agricultural wastes (cellulosic) treatment and characterization using different methods and analyzing the figures of scanning with electron microscope. ····· 10361102673
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The first aim of this study is to evaluate the radiological impact of the oil refining process to obtain an extensive view to the radiological bidden of the petroleum industry in Egypt. The second aim is intended to set-up working guidelines for the workers in the companies and regulators with an understanding of occupational and environmental risks from TENORMs generated in oil refining facilities in Egypt beside the disposal of sludge without the treatment to environment. The last aim of the study is the recovery of the hydrocarbon content of the sludge using petroleum cuts and solves the problems of the disposal into environment The overall cost as well as time involved for recovery and the disposal of hydrocarbon residue has been decreased. Capillary gas chromatography was used to estimate the economic value and reuse of recovered oil. ····· 10361102629· 1 ·· 2 ·· 3 ·· 4 ·· 5 ·
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