Author: René WENDLINGPublisher:
ISBN:
Category :
Languages : fr
Pages :
Book Description
Contribution à l'étude de la séparation et du dosage du fer sous ses valences zéro, deux et trois
Author: René WENDLINGContribution à l'étude du protoxyde de fer
Author: Fernand MarionPublisher:
ISBN:
Category :
Languages : fr
Pages : 54
Book Description
Le but de notre travail est la détermination de la surface qui représente le domaine d'équilibre du protoxyde de fer. Les variations de la composition chimique de l'oxyde ferreux préparé par l'intermédiaire d'une phase gazeuse oxydo-réductrice ainsi que les variations correspondantes de la densité, du paramètre cristallin, de la conductivité électrique et du point de fusion, ont été étudiées. Nous avons déterminé la composition du protoxyde de fer en équilibre avec le fer, préparé par réaction par voie solide. Les résultats précédemment obtenus au moyen de l'analyse chimique sont retrouvés et précisés par étude des variations de la conductivité électrique. Une confrontation de nos résultats avec ceux des travaux antérieurs termine cette étude. Dans la partie II, nous avons mis au point un dosage de fer sous ses 3 états qui permet l'analyse complète d'un mélange de fer et de ses oxydes. Ce dosage s'applique en particulier aux éponges de fer de réduction directe et aux laitiers.
Contribution a l'etude du dosage de submicrotraces de fer par p...
Author: Jacques BuffleAnalytical Methods in the Nuclear Fuel Cycle
Author: Sustainability of Rice in the Global Food System
Author: Noreen G. DowlingPublisher: Int. Rice Res. Inst.
ISBN: 9712201074
Category : Technology & Engineering
Languages : en
Pages : 413
Book Description
Scanning Microscopy for Nanotechnology
Author: Weilie ZhouPublisher: Springer Science & Business Media
ISBN: 0387396209
Category : Technology & Engineering
Languages : en
Pages : 533
Book Description
This book presents scanning electron microscopy (SEM) fundamentals and applications for nanotechnology. It includes integrated fabrication techniques using the SEM, such as e-beam and FIB, and it covers in-situ nanomanipulation of materials. The book is written by international experts from the top nano-research groups that specialize in nanomaterials characterization. The book will appeal to nanomaterials researchers, and to SEM development specialists.
Elemental Speciation in Human Health Risk Assessment
Author: P. ApostoliPublisher: World Health Organization
ISBN: 9241572345
Category : Medical
Languages : en
Pages : 257
Book Description
Definitions of species and speciation - - Strructural aspects of speciation - - Analytical techniques and methodology - - Bioaccessibility and bioavailability - - Toxicokinetics and biological monitoring - - Molecular and cellular mechanisms of metal toxicity - - Health effects - - Conclusions and recommendations.
Biological Nitrogen Fixation Associated with Rice Production
Author: Mustafizur RahmanPublisher: Springer Science & Business Media
ISBN: 9401586705
Category : Science
Languages : en
Pages : 244
Book Description
Biological nitrogen fixation (BNF) has become important in rice farming systems because this process diminishes the need for expensive chemical fertilizers which have been associated with numerous health and environmental problems. The extensive exploitation of BNF would provide economic benefits to small farmers, avoiding all malign influences of chemical fertilizers. Meanwhile, advances in biotechnology have brought rice genetics to the threshold of new opportunities for increasing rice production. This volume focuses, in six different sessions, on the role of BNF in the improvement of rice production in the light of the current state of the art of BNF technology transfer and diffusion. New ideas on BNF technology in research, extension information and inoculant technology are also included, together with the socio-economic impacts of using BNF in rice farm systems.
Performance of Cement-Based Materials in Aggressive Aqueous Environments
Author: Mark AlexanderPublisher: Springer Science & Business Media
ISBN: 9400754132
Category : Technology & Engineering
Languages : en
Pages : 471
Book Description
Concrete and cement-based materials must operate in increasingly aggressive aqueous environments, which may be either natural or industrial. These materials may suffer degradation in which ion addition and/or ion exchange reactions occur, leading to a breakdown of the matrix microstructure and consequent weakening. Sometimes this degradation can be extremely rapid and serious such as in acidic environments, while in other cases degradation occurs over long periods. Consequences of material failure are usually severe – adversely affecting the health and well-being of human communities and disturbing ecological balances. There are also large direct costs of maintaining and replacing deteriorated infrastructure and indirect costs from loss of production during maintenance work, which place a great burden on society. The focus of this book is on addressing issues concerning performance of cement-based materials in aggressive aqueous environments , by way of this State-of-the-Art Report. The book represents the work of many well-known and respected authors who contributed chapters or parts of chapters. Four main themes were addressed: I. Nature and kinetics of degradation and deterioration mechanisms of cement-based materials in aggressive aqueous environments, II. Modelling of deterioration in such environments, III. Test methods to assess performance of cement-based materials in such environments, and which can be used to characterise and rate relative performance and inform long term predictions, IV. Engineering implications and consequences of deterioration in aggressive aqueous environments, and engineering approaches to the problem.
Adhesion Between Polymers and Concrete / Adhésion Entre Polymères Et Béton
Author: H. R. SassePublisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 792
Book Description
Preface Adhesion is a phenomenon architects and civil engineers are not very familiar with. In other disciplines knowledge about surface properties and the background of bonding energies is also far from satisfactory; nevertheless there are many important· applications in concrete engineering, where adhesion is necessary for success and durability. These include: - coating and painting - repair of concrete surfaces - bonding of fresh to old concrete - crack injection - glueing of precast elements - glueing of steel to concrete, etc. In 1981 RILEM established the technical committee 52-RAC 'Resin Adherence to Concrete'. The main aims of the committee's work were - to collect research results and practical experiences - to initiate and coordinate research programs - to develop, on a scientific base, test methods for field and for laboratory purposes. One of the results of the committee's work is a state-of-the-art report, which will be presented orally as a General Report at the International Symposium ISAP '86, and will be printed either in the RILEM journal Materials and Structures or separately. Several test recommendations have been elaborated and will be prepared as drafts for the participants ofISAP '86. These are: - direct tensile test - pull-off test - direct shear test - slant shear test - four-point bending test - dynamic loading test - thermal compatibility test (two versions) - injectibility test.