Aggregates Products

• Mineral trioxide aggregate (MTA) was developed more than 20 years ago to seal the pathways of communication of the root canal system. It?s currently the preferred material used by endodontists because of its superior properties such as its seal and biocompatibility that significantly improves outcomes of endodontic treatments. Dr. Torabinejad, who was the principle investigator of the dental applications of MTA, and leading authorities on this subject provide a clinically focused reference detailing the properties and uses of MTA, including vital pulp therapy (pulp capping, pulpotomy), apexification, pulp regeneration, repair of root perforations, root end filling and root canal filling. Line illustrations and clinical photographs show proper technique. An accompanying website features photographs and video presentations for selected procedures using MTA. Mineral Trioxide Aggregate: Properties and Clinical Applications is an ideal book for dental students and endodontic residents learning procedures for the first time as well as practicing dentists and endodontists who would like to improve outcomes of endodontic treatments.

• This book compiles the accomplishments of the recent research project on photochemistry ?Photosynergetics?, supported by the Ministry of Education, Culture, Sports, Science and Technology of Japan, aiming to develop and elucidate new methods and molecules leading to advanced utilization of photo-energies. Topics include photochemical responses induced by multiple excitation, multiphoton absorption, strong modulation of electronic states, developments of new photofunctional molecules, mesoscopic actuations induced by photoexcitation, and novel photoresponses in molecules and molecular assemblies. The authors stress that these approaches based on the synergetic interaction among many photons and many molecules enable the expansion of the accessibility to specific electronic states. As well, they explain how the development of reaction sequences and molecules/molecular assemblies ensure ?additivity? and ?integration? without loss of the photon energy, leading to new photoresponsive assemblies in meso- and macroscopic scales.

• The scarcity of natural sands, particularly in large urban centers, which has led the construction industry to become interested in the topic. Regarding the technical applicability of recycled fine aggregates, scientific researches have shown the feasibility of their use. However, such researches usually try to fit them to the granulometric curve of conventional aggregates, something complex and still subject of discussion. Under this context, based on the assumption that the particle size fractions of the fine recycled aggregates present different characteristics, and that, therefore, these characteristics would influence differently the properties of mortars and concretes; the work proposes the study of the particle size fractions of two recycled sands, AR1 (sand from a RCD plant) and AR2 (sand from RC of specimens from a concrete plant).The results showed that the AR1 sand and its powdery fraction are able to refine pores of mortars and that there are differences in the physical-mechanical behaviors of recycled mortars as the granulometric fraction is replaced, increasing the possibility of application of fine aggregates in mix designs.

• This text covers traditional community health issues such as epidemiology, community assessment, economic issues, and ethics. Other topics addressed include poverty, homelessness, substance abuse, violence, AIDS, and sexually transmitted diseases.

• Mineral trioxide aggregate (MTA) was invented in the mid-1990s at Loma Linda University, USA, with the aim of introducing a material for use as a root-end filler that would set and develop its properties in the presence of moisture. MTA is a mixture of Portland cement and bismuth oxide, which is added to enhance the radiopacity of the material. These two components are mixed with water to produce hydrated cement. This book concisely presents information on diverse aspects of MTA and its use with a view to making it more widely available to clinicians and researchers. The topics covered include the development of MTA and its introduction into clinical dentistry, its chemical composition and setting characteristics, manipulation and placement, material properties, reactivity and the influence of environmental factors. The clinical applications are clearly explained and related innovations and further materials currently available on the market are also discussed.

• Light scattering from particles in the nanometric and micrometric size range is relevant in several research fields, such as aerosol science and nanotechnology. In many applications, the description of the optical properties of non-spherical, inhomogeneous particles is still inadequate or requires demanding numerical calculations. Lorenz?Mie scattering and effective medium approximations represent currently the main theoretical tools to model such particles, but their effectiveness has been recently called into question.
• This work examines how the morphology of a particle affects its scattering parameters from an experimental standpoint, supporting findings with extensive simulations. The dust content of Antarctic, Greenlandic, and Alpine ice cores is analysed with a particle-by-particle approach. Moreover, a study on colloidal aggregates shows that correlations among the fields radiated by primary particles are responsible for the poor agreement of effective medium approximations with experimental results. On the theoretical side, an interpretation in terms of the structure factor is given, which satisfactorily describes the data. The insights of this thesis are relevant for quantifying the contribution of mineral dust to the radiative energy balance of the Earth.

• This book focuses on the utilisation of construction waste material as coarse aggregate in making concrete. It discusses in detail the behaviour of recycled aggregate under impact load along with other structural applications, and explains the various quality-improvement techniques for recycled aggregate and recycled aggregate concrete (RAC). The first chapter describes the importance of recycling construction and demolition waste and the status quo of global construction and demolition waste recycling. The second chapter examines the recycled aggregate production methodology. Subsequent chapters address the physical and mechanical characteristics and different research findings, as well as the engineering properties of recycled aggregate concrete. Further, the interrelationships among the mechanical properties of recycled aggregate concrete are discussed. The book also explores long-term properties like shrinkage and creep, durability properties, and microstructural characterisation. It will serve as a valuable resource for researchers and professionals alike.

• This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.
• This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.

• In a series of stimulating papers (198la, l98lb, and Robert Shiller uses seemingly powerful variance bounds tests to show that variations in aggregate stock market prices are much too large to be justified by the variation in subsequent dividend payments. Under the assumption that the real expected return on the market remains essentially constant over time, Shiller concludes that the excess variation in stock prices identified in his tests provides strong evidence to reject the Efficient Market Hypothesis. Even if the real expected return on the market does change over time, Shiller further concludes that the amount of variation in that rate necessary to save the Efficient Market Hypothesis is so large that the measured excess variation in stock prices cannot be attributed to this source.
• We need hardly mention the significance of such a conclusion. If Shiller's rejection of market efficiency is sustained, then serious doubt is cast on the validity of the most important cornerstone of modern financial economic theory. To be sure, of the hundreds of earlier tests of efficient markets, there have been a few which appear to reject market efficiency [cf.

• First published in 1999, this volume examines the role and effects of financial liberalisation in ten deregulated Asian developing countries including Indonesia, Malaysia, Myanmar, Nepal, the Philippines, Singapore, South Korea, Sri Lanka, Taiwan and Thailand. These areas experienced significant financial and economic changes between the ?financially repressed economies? of the 1970s through to the 1990s. Muzafar Shah Habibullah approaches this issue in two parts. Part 1 provides empirical evidence of relationships between monetary aggregates, nominal income and price level. In part 2, he offers an early attempt to evaluate the Divisia monetary aggregate as an alternative to the Simple-sum aggregate as an indicator for the financial and economic situation of Asian developing countries.

• This work deals with J-aggregates, which have a long history of research. The volume covers electronic states, linear and nonlinear optical properties. Various properties and processes of J-aggregates, such as super-radiance, excitons, photon echo, geometrical structure, electron transfer and femtosecond spectroscopy, are discussed.

• Construction industry relies heavily on conventional material such as cement, sand and gravel for the production of concrete. The river sand and gravels which are most commonly used as fine aggregates and coarse aggregates respectively in the production of concrete, poses the problem of acute shortage in many areas, whose continued use has started posing serious problem with respect to its availability, cost and environmental impact. An attempt is being made in this project to use the locally available waste materials to replace the river sand and gravels to produce light weight and low cost concrete. Sawdust and Brick ballast are easily affordable at low cost or free of cost, which are partially replaced with river sand and gravels respectively for making concrete. Sawdust can be defined as loose particles or wood chippings attained as by products from the sawing of timber into standard useable sizes. Brick ballast is common in the form of over burned bricks. Natural sand and Gravels were partially replaced with sawdust and broken brick ballast respectively.