Concrete material science

Xem 1-20 trên 59 kết quả Concrete material science
  • Advanced Topics in Biomineralization is a compendium of current topics focusing on processes of formation, organization, as well as mineralization of novel structural materials. From enchondral ossification to the application of biomineralized cement, the subject of biomineralization encompasses a range of diverse disciplines including molecular biology, supramolecular chemistry, materials science and engineering. A common theme in all these areas of research in biomineralization is the ability to utilize strategies from Nature to create functional materials.

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  • In response to the enactment by the U.S. Congress of the Intermodal Surface Transportation Efficiency Act (ISTEA), the Federal Highway Administration (FHWA) requested that the National Research Council (NRC) conduct a study on nonconventional concrete technology for renewal of the highway infrastructure. ISTEA directed the FHWA to initiate a comprehensive, long-range infrastructure research and development (R&D) program.

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  • Leading mining companies have taken up the chal- lenge and are pushing beyond minimum legal requirements through voluntary initiatives, to ensure their continued “license-to-operate” from the com- munity as well as increasing their competitive advantage through continuous, voluntary improve- ments in environmental performance. As with all mining activities, the extraction and bene- ficiation of phosphate rock and potash to produce mineral fertilizer raw material has the potential to cause environmental impacts.

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  • When a user with read-only permission logs into the database server, he or she is able to see the geodatabase and the data stored in it. This user can query the database and use the data in ArcMap but cannot edit the data (unless the user is granted read/write permissions on specific datasets. Dataset permissions are discussed in the next section). Users granted read/write geodatabase-wide permissions cannot only view and query the data but can also edit all data in the geodatabase.

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  • “The problem isn’t the number of jobs in America; it’s the quality of jobs. Look closely at the economy today and you find two growing categories of work – but only the first is commanding better pay and benefits. This category involves identifying and solving new prob- lems. Here, workers do R&D, design and engineering. Or they’re responsible for high-level sales, marketing and advertising. They’re composers, writers and producers. They’re lawyers, bankers, fi- nanciers, journalists, doctors and management consultants.

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  • Not all materials can be etched in an easy and cheap way. Especially, noble metals or tantalum are stable against most of these corrosive structuring methods. Hence, precision machining may be used to generate microstructures from these metals as well as from standard metal alloys such as stainless steel or hastelloy. Depending on the material, precision machining can be performed by spark erosion (wire spark erosion and countersunk spark erosion), laser machining or mechanical precision machining.

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  • Periodontal disease is one of the major dental pathologies that affect human populations worldwide at high prevalence rates (Petersen, 2003). Periodontal diseases represents a family of heterogeneous chronic inflammatory lesions that involve the periodontium, a connective tissue protected by the epithelium, important to attach the teeth to the bone in the jaws and to support the teeth during function (Taylor, 2003).

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  • As human beings currently use or appropriation of approximately 40% (through deforestation and land-use change) land production capacity, accurate account of all existing and potential biomass energy road use is important to chart the way forward in global scale, and in different areas. With the complexity of biomass as a source of many end products, food, this volume shed light on all topics related to biomass highlight new and review existing methods of production, its detection and usage....

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  • This section provides information specific to utility green pricing programs, a subset of the market. The number of utilities offering green pricing has grown steadily in recent years—today, more than 850 investor-owned, public, and cooperative utilities in most states offer green pricing programs. Appendix D provides a list of utilities offering green pricing, and Appendix E provides Web links to all green power product offerings.

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  • Autonomous navigation of walking robot requires three major tasks to be addressed: self-localization, avoiding obstacles, and object handling (Clerentin et al, 2005). In the present study, we suggest some basic contact interaction-based navigation system known as "groping campaign" the humanoid robot able to determine the localization and avoid obstacles. this system is based on the contact interaction with the aim of creating the appropriate algorithm for a humanoid robot performance in the real environment....

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  • Actually different types of classifiers can be set for BCI technology, from physiological point of view BCI devices may be classified in exogenous and endogenous. the external devices to provide some kind of stimulation to users and use them to analyze the respond to them, an example of this class of devices based on evoked potentials or P300 pictures (KM Spencer and E. Donchin and R. Wijesinghe, 2000).

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  • This study explores the implementation of two contemporary approaches to teaching writing, Writer’s Workshop and 6+1 Traits of Writing. The purpose of the study was to help fourth grade students become proficient writers both in their descriptive writing content and in their written mechanics. The study also compares the transfer of written skills using these approaches versus the commonly taught Daily Oral Language process and grammatical textbook activities. Throughout the study, students were actively involved in many hands-on writing activities.

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  • In this paper, we identify a set of interior design guidelines for furniture layout and develop an interactive system based on these guidelines. In our system, the user begins by specifying the shape of a room and the set of furniture that must be arranged within it. The user then interactively moves furniture pieces. In response, the system suggests a small set of furniture layouts that follow the interior design guidelines. The user can interactively select a sug- gestion and move any piece of furniture to modify the layout.

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  • In the MCA, three evaluation aspects were considered: feasibility; applicability; and effects of financing mechanisms. Each of these aspects further consisted of specific criteria, resulting in total of eight evaluating criteria (for more details see chapter 6.4.3 and annexes 24 and 26): legal feasibility; institutional feasibility; social feasibility; preparation, technical applicability; transaction costs; effectiveness; and side effects.

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  • Genetic diversity is the fundamental source of biodiversity. In 1989, the World Wildlife Fund defined biodiversity as “the richness of life on Earth – millions of plants, animals and microorganisms, including the genes which they carry, and complex ecosystems that create the environment”. Currently, the issue of maintaining genetic diversity as a component of the conservation of biodiversity has been accepted at an international level. FAO has included the issue of conservation, evaluation, and the use of animal genetic resources in its fields of interest since the 1970s.

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  • By clearly stating and understanding the core beliefs that an organization has or wants to adopt about ethical issues such as honesty, integrity, dignity of individuals, or caring about others, policies that are straightforward and easily implementable can be designed. By clearly thinking through a position on the environment, whether to comply with the law or to leave the earth better than we found it, we can begin marshaling the resources to realize these basic beliefs.

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  • Other researchers have studied the issues examined here. Excellent articles by Blumberg and Nichols (2004), Chernew and Hirth (2004), and Gruber and Madrian (2004) have carefully documented many reasons why so many Americans are uninsured. There is no single and simple explanation about why many firms refuse to offer insurance and why employees sometimes refuse to accept these offers. The problem is complex. In this article, we focus on labor market turnover and expectations to explain firms’ insurance offer decisions.

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  • A major stumbling block of manual approaches is the problem of keeping the alignments up to date with new releases of protein sequences.Arobust and efficient updating scheme is required to ensure stabil- ity of the database. These requirements are met in Pfam by using two alignments: a high quality seed alignment, which changes only little or not at all between releases, and a full alignment, which is built by automatically aligning all members to a hidden Markov model-based profile (HMM) derived from the seed alignment.

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  • The quantity and the quality of the illumination are aspects that you should pay utmost attention to as far as the choice of your future projection system is concerned. Different projector models are available depending on the maximum screen widths they can be used for and, consequently, the type of lamps they use. Please bear in mind that if you would like to screen in 3D, a change in the lamp power must be possible. This point will be addressed in § “3D“. The related choices affect above all the environment of the projector and the way to operate it. These...

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  • A high number of pesticides is used in Colombia primarily in categories I and II toxicological categories, and by chemical group the OF and C. This information is confirmed by other studies conducted in Colombia (Varona et al, 2007, 2009), (SIVIGILA, 2010), thus increasing the chances of triggering effects on health. Among the clinical manifestations reported by laborers, most of them are related to neurological and sensory organs disorders.

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