für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Hydrogen can be produced by numerous techniques, with no emission of pollutants and green house gases. Hydrogen has a number of attractive advantages such as high energy density, non-toxic reaction products and abundant natural resources. Sodium borohydride has been considered as hydrogen storage material in the use of renewable energy sources on the way towards sustainable energy of the future. Via this research work, we studied the effect of different phosphorus compounds on the catalytic activity of ruthenium(III) acetylacetonate in the hydrolysis of sodium borohydride and on the kinetics of the catalytic hydrolysis. In addition, synthesis and characterization of ruthenium(III) acetylacetonato complexes containing two trimethylphosphite ligands were studied. Finally, isolation, stabilization and characterization of new ruthenium species (active catalyst), formed during catalytic hydrolysis of sodium borohydride starting with Ru(acac)3 and P(OMe)3, were discussed. ····· 1036186832
····· lezzter Preis 61.20€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Corrosion damages is the biggest item on the maintenance bill of reinforced concrete (RC) structures. Chloride induced corrosion is the main cause for corrosion initiation. Chloride is the main cause for corrosion initiation in RC. Understanding the corrosion process and the parameters which influence the susceptibility for corrosion initiation, is essential for reducing the cost of corrosion in modern buildings. This book presents the theory of corrosion in reinforced concrete and describe an investigation of the relationship between the micro-structure of the interfacial transition zone (ITZ) between the concrete and the embedded steel and the chloride concentration for corrosion initiation (chloride threshold). It includes a complete description of the method used in the investigation, results, and comprehensive discussion. ····· 1036125285
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray N-methyldiethanolamine (N-MDEA) is used in the natural gas refinery process to remove carbon dioxide (CO2) and hydrogen sulphide (H2S) and was discharged as pollutants with other aromatic hydrocarbons such as Benzene-Toluene-Xylene (BTX) compounds. The small leakage of this component will contaminate the environment and lead to heavy water pollution. These dangerous materials that polluted the water system can effect the aquatic life by consume dissolved oxygen. Thus, some effort must be carried out to overcome these problems. In this study, photocatalytic process has been introduced for the treatment of these compounds using coupled ZnO/TiO2, WO3/TiO2 and ternary ZnO/WO3/TiO2 which were prepared via sol-gel method. The parameters studied in this research were ratio of photocatalyst used, the effect of sonication and ozonation processes, various initial concentrations of substrate and different UV wavelength for the degradation of N-MDEA and BTX compounds in aqueous system. This research should help and provide a new insight to the scientist worldwide in waste water treatment or anyone else who may be considering utilizing this techniques for green environmental efforts. ····· 1036124653
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The book `Conversion Coatings on Aluminium` describing the various kinds of surface treatments, conversion coatings of aluminium and its alloys. Aluminium and its alloys have many kinds of composition and very difficult to optimize a certain pre-plating procedure that will be important for the industrial plating procedure. This is the out put of our original research work done in the laboratory (Advanced Materials Research Laboratory, Periyar University, Salem-636 011, Tamil Nadu, India). This book is very useful for the research scholars and students whoever are working in the field of composite/conversion coatings on aluminium. ····· 1036124649
····· lezzter Preis 53.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The book entitled with `Solution Ionophoretic Technique in Study of Metal-Ligand Equilibria` deals with solution ionophoretic technique,which is used for the determination of the stability constants of metal complexes is better than other physiochemical methods but it has some vitiating factors (e.g. diffusion, ionic strength and temperature). This technique is free from these vitiating factors and results are fairly reliable. The technique used in these studies proved to be very useful in studying the stepwise complextion in solution. The special electrophoretic tube which has been designed for this work, yields better results after standardization. This technique provides vivid picturization of complex formation whose stability constant can be determined easily. Its further extension in the study of mixed complexation reactions is obviously a unique advancement in the realm of coordination chemistry. ····· 1036124602
····· lezzter Preis 71.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book highlighted the methods used for the syntheses of thiosemicarbazide and their metal complexes. Molecular modelling for all prepared compounds was investigated. Dissociation and formation constants were calculated for ligands and complexes respectively. In vitro and in vivo studies for thiosemicarbazides showed high potent antitumor activity. Finally, this book reported thiosemcarbazide derivatives as organic chelates (which are not pollutant for water media and may have biological importance) for the separation of about 100% of Hg2+, Mn2+ and Cd2+ ions. ····· 1036124483
····· lezzter Preis 88.20€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray El estudio de los complejos metálicos con ligandos de naturaleza tiolato puede considerarse, dentro de la Química de la Coordinación actual, un campo de gran relevancia. Ello es debido a diferentes factores, entre los que podríamos destacar, en el área de la Bioinorgánica, por el papel que juegan las uniones metaltiolato en diferentes metaloproteinas, por su interés en el campo de la medicina al poder ser utilizados como agentes antitumorales y por último por su capacidad de ser usados como precursores en procesos de deposición de películas finas semiconductoras bien del metal o de sulfuros metálicos a partir de fases gaseosas. Estos procesos exigen, por una parte, la presencia de especies de baja moleculariad y por otra que estas especies sean suficientemente estables de tal forma que puedan ser sublimadas sin que se produzcan procesos previos de descomposición. ····· 1036123944
····· lezzter Preis 62.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Los procesos para la deposición de recubrimientos en el estado sólido tales como la Vaporización Física (PVD) y Rociado Térmico, se han empleado para depositar materiales tanto metálicos, cerámicos y una mezcla de éstos. Por medio del proceso de Aleado Mecánico (AM) ha sido posible la obtención de materiales base titanio, que por los métodos convencionales sería imposible de obtener. Con el AM, se obtuvieron aleaciones base titanio en los sistemas Ti-Al, Ti-BN y Ti-Al-BN para la deposición de recubrimientos por PVD y Rociado Térmico. Todos los sistemas de aleación después de molienda reportaron un tamaño de grano del orden de nanómetros. El sistema Ti-Al presentó una gran tendencia a la formación de TiH conforme se incrementó el contenido de aluminio. El sistema Ti-BN mostró una gran afinidad a la formación de TiN, TiB y TiB2. El sistema ternario Ti-BN-Al reportó a bajos contenidos de aluminio una mayor proporción de la fase TiB2 mientras que a altos contenidos de aluminio prevalecen los compuestos de aluminio Ti2AlN y Al2Ti. Los sistemas de aleación base titanio no antes reportados en la literatura muestran ser materiales potenciales para problemas de corrosión-erosión. ····· 1036123050
····· lezzter Preis 26.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray En la industria farmacéutica se emplean diferentes minerales como principios activos o excipientes en las formulaciones. A partir de diversos minerales es posible también sintetizar sales químicas que cumplan las especificaciones establecidas en esta exigente industria. En el presente trabajo se ofrecen los principales minerales que pueden o son empleados en la actualidad, así como sus principales características. Entre ellos se encuentran el carbonato de calcio, magnesita, kaolín, bentonita, dolomita y zeolita. De todos ellos existen yacimientos en el país y no siempre son empleados con estos fines. En la actualidad se realizan estudios con vistas a aumentar el espectro de utilización de los mismos y proponer nuevas aplicaciones, así como ampliar el número de minerales a emplear, entre los que se encuentran la sheridanita y el vidrio volcánico, de los cuales también se explotan yacimientos con otros fines. Los resultados obtenidos manifiestan la factibilidad de obtención de sales químicas de uso farmacéutico a partir de diversos minerales y la posibilidad de su empleo en distintas formulaciones farmacéuticas, utilizando procesos de síntesis o purificación. ····· 1036122829
für 35.91€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Vitamins are essentially required by the human body for its various biochemical and physiological processes. Ascorbic acid (vitamin C) is a water-soluble vitamin which is found in many biological systems and foodstuffs (fresh vegetables and fruits). The easiest and best way to take vitamin C is through liquid diet. Now a day`s many liquid juices are available in market claiming high levels of vitamin C content. The book is about ascorbic acid (vitamin C) content in juices, beverages, powdered samples, soft drinks marketed in Islamabad -Pakistan. Results were compared with labeled values quoted on the packs. Method of ascorbic acid by Polarograph has been described in detail. ····· 1036121503
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray A polymeric ligand can be used to bind selectivity a specific metal ion form a mixture to isolate important metals from sea or waste water, or to remove toxic metal ions from waste water. This is based on different formation constants between the polymeric ligand and various metal ions. A polymeric ligand is usually used in an insoluble resin form to separate a specific metal ion from a solution containing metal ions. The successive stability constants for the complexation of metal ion with multidentate ligand such as polyvinyl derivatives are different from those of typical metal complexes. The aim of the present work includes the admiration of acryloyl chloride with sulphaguanidine and 2,6-diaminopyridine. The formed monomers were reacted with different metal salts by different methods forming polymer complexes. Different spectroscopic and magnetic measurement techniques were used for elucidation of the structures. Thermal stability of the formed polymer complexes was compared with corresponding homopolymers. ····· 1036121471
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The focus of the study is the spin column design with different materials. Effects of the binding of DNA with silica, glass microfiber membrane, whatmann filter paper under different binding conditions are discussed. Silica-based media and glass fiber membrane have become the standard for DNA binding in the plasmid preparation process. Chaotropic salts facilitate binding of DNA to the media. This creates a convenient way to wash away contaminants prior to eluting the DNA with a neutral solution, such as TE Buffer or water. Filter paper pellets can easily be processed by vacuum filtration or centrifuge to yield desired quantities of DNA. The use of spin column is a rapid, economic and sensitive method for DNA isolation. The use of these extraction method is both time and cost saving. Average, standard deviation, and coefficient of variation have been calculated for three methods. ····· 1036121415
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The isolation of the unsymmetrical Schiff bases posed some challenges. Majority of unsymmetrical Schiff bases reported in the literature were synthesized via a stepwise approach. There are only a few procedures which proceed via a one-pot condensation approach because the introduction of different carbonyl groups might lead to the formation of a mixture of products. But by fine-tuning some of the reaction conditions we were able to isolate the desired unsymmetrical Schiff bases at room temperature. The new synthetic procedure for the preparation of the unsymmetrical Schiff bases was developed in our laboratory. The isolation of the unsymmetrical Schiff bases and their VO(IV) complexes as well as some of the symmetrical Schiff bases and their complexes generated in this research work was considered to be novel. The in vitro and in vivo insulin-mimetic studies show that majority of the Schiff base complexes of VO(IV) were active and two of the complexes were as active or more active than insulin. The new results generated in this work significantly advance scientific knowledge and make a useful contribution in the area of insulin-mimetic studies. ····· 1036121284
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The text book entitled Fundamentals of Inorganic Chemistry covers both the theoretical and descriptive aspects of the subject and emphasis mostly on topics required for undergraduate programme in chemistry. Many worked out examples have been included along with exercises necessary to enhance their analytical skills. The summary of chapter has been given at the end of each chapter. The book has been made more informative and voluminous and the subject matter has been presented in a very simple language, clear style along with a large number of fully illustrative diagrams. In all the chapters, a number of solved examples have been incorporated to understand the concept easily and also that would help in attempting to solve the given questions and problems. The questions in the form of exercises would enable the students to know and have a better idea of finding the all possible and probable questions for the examination. As an Author, I personally believe that this text book will definitely deliver all necessary information for the benefit of readers. ····· 1036121180
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Metal-carboxylate complexes and coordination polymers are the fields of research that has risen rapidly over recent years to the forefront of modern chemistry and material science. Simultaneously the crystal engineering of metal carboxylates, especially coordination polymers has been greatly developed in the past decade. Supramolecular architecture of metal carboxylates can be directly constructed by using metal ions existing in various coordination geometries combined with multifunctional ligands. This book presents the synthesis, characterization and structural aspects of some first row transition metal carboxylates along with the study of molecular/anion recognition properties of carboxylic acid derivatives. The synthetic methods, diverse coordination modes, attractive solid-state structures, solution behaviour, as well as their diverse applications are discussed. Special efforts have been made to discuss the formation of different types of the structures and the control over their syntheses. ····· 1036121110
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The work covered herein discusses for the first time various techniques used in the fabrication of metal oxide nanofibers and nanotubes from eletrospun carbon fibers as templates. The nanofibers were prepared by electrospinning metal oxide precursor inside a polymer matrix. The metal oxide tubes were by tubes by fiber templating. This was followed by calcination to yield the nanofibers and nanotubes. Their morphological, structural, optoelectronic and catalytic properties are also discussed. Among key applications they have found utilization as catalyst supports. Palladium nanoparticles have been supported on Titanium dioxide nanofibers and applied in Heck-coupling reactions. Similarly, included is the effect of impurities on the metal oxide tubes properties done by doping with metal ions. In addition, photocatalytic behavior of metal oxides nanofibers have also been discussed. ····· 1036120456
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The increased use of diesel driven vehicles for all categories of commercial automobiles and even for private cars is the major trend observed worldwide in transportation field. The energy advantages of the diesel engines are unquestioned, lower cost of diesel fuel is also responsible for its increasing popularity, particularly with respect to the less developed countries. The major pollutants emitted from diesel engines are PM (particulate matter) and NOx. The PM is a potential carcinogen and its effective control is a primary target from environmental point of view. The most promising approach to reduce the PM emissions from diesel vehicles is after-exhaust treatment, using a Diesel Particulate Filter (DPF). ····· 1036120455
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Three new ligands have been prepared in this work, which were chosen to synthesis a new set of transition metal complexes [Cu (II), Ni (II), Hg (II), Cd (II) and Co (II)]. LI=(2-[5-phenyl-2-methylthio-1,3,4-oxadizole]-5-phenyl-1,3,4-oxadiazole), LII=2-(O-chloro benzylidine) hydrazine benzothiazole and LIII=2-(p-hydroxy benzylidine) hydrazine benzothiazole were prepared by Schiff reaction between 2-mercaptobenzothiazole and 2-chlorobenzaldehyde and p-hydroxy benzaldehyde. The new ligands were characterized by the Infra-red spectroscopy and melting points. The metal complexes, were prepared and isolated in pure solid state, and found to be stable toward light, heat and moisture. These new complexes were characterized via FT.IR , UV-Vis Spectroscopy, magnetic and conductivity measurements. In addition the metal contain were determind by atomic absorption measurement. Different bonding and structural behavior were revealed through the study of the coordination chemistry of the metal complexes of the new ligands. ····· 1036119992
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray One of the most important global issues being addressed currently is the storage and release of energy. Hydrogen, due to its light weight, high abundance and safe reaction byproduct is the ideal way to store energy. However, hydrogen s nature as a gas makes it difficult to store efficiently. Metal organic frameworks have been shown to be nearly ten times as efficient in storing a gas compared to a chamber devoid of their presence. Self-assembled ruthenium squares, cubes, and triangles may have the same storage efficiencies. However, the self-assembled structures offer the advantage of control whereby the gas stored may be captured or released when the structure is oxidized or reduced. This book details the synthesis and analysis of ruthenium(II) thioether corners and self-assembled structures. ····· 1036119935
für 64.71€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The book presents the synthesis of silica aerogels and wide applications in industrial and other fields owing to their exceptional unique properties of silica aerogels. The silica aerogels are synthesized using different methods and the attempts have been made to reduce cost and enhance strength of silica network using various approaches. The silica aerogels are synthesized by Sol-Gel process followed by ambient pressure drying or supercritical extraction process. The experimental results on surface modification process and tuning of surface free energy of silica aerogels are demonstrated. Also the experimental details on synthesis of silica aeroges by new rapid supercritical extraction process within 3 h of total processing time, i.e. direct sol to aerogels are discussed in details. ····· 1036119162
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The detection and measurement of gamma radiation using materials that are sensitive to such radiation has been a subject of intense investigation. Optical fiber is found to be a good choice in this regard due to greater sensitivity at different dose levels compared to bulk glass dosimeters. The major advantage in using the fiber is that the radiation sensitivity can be adjusted to the dose or dose rate by selecting suitable fiber design, composition and operating wavelength. In addition, the fibers feature a small weight and transverse size, as well as immunity to electromagnetic interferences. So the dosimeter dimensions can be very small within the area (approx. dia around 3cm ) of wristwatch. The objective of the present thesis work is to develop suitable radiation sensitive optical fibers which can be used as radiation sensor for fiber optic dosimetry application. ····· 103613286· 1 ·· 2 ·· 3 ·· 4 ·· 5 ·
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