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With greater need for treating root surface lesions, dentinal adhesives are more in demand. For successful treatment, all factors--dentin, tooth, patient and materials--must be considered. 相似文献
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D. Heymann 《Fullerenes, Nanotubes and Carbon Nanostructures》1996,4(3):509-515
The solubilities of C60 and C70 at 25°C in seven normal alcohols obey the relationship InY = a + bX + cX2, where Y is solubility and X is the Hildebrand solubility parameter of the solvent. Extrapolation to the solubility parameter of water yields solubilities in water of 1.3'10-11 (C60) and 1.3'10-10(C70) ng/ml with an uncertainty of one order of magnitude. 相似文献
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Dieter Heymann 《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(6):1079-1086
Abstract A search was made for C60 fullerene by High Performance Liquid Chromatography in char formed on a Norway Spruce struck by lightning. Firm proof that C60 occurs in the char was not obtained. However, the evidence showed the possible presence of 1 ppb C60. 相似文献
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Matthias Heymann 《NTM》2009,17(2):171-197
Constructing Climate. From Classical Climatology to Modern Climate Research
Both climate researchers and historians of climate science have conceived climate as a stable and well defined category. This
article argues that such a conception is flawed. In the course of the 19th and 20th century the very concept of climate changed
considerably. Scientists came up with different definitions and concepts of climate, which implied different understandings,
interests, and research approaches. Understanding climate shifted from a timeless, spatial concept at the end of the 19th
century to a spaceless, temporal concept at the end of the 20th. Climatologists in the 19th and early 20th centuries considered
climate as a set of atmospheric characteristics associated with specific places or regions. In this context, while the weather
was subject to change, climate remained largely stable. Of particular interest was the impact of climate on human beings and
the environment. In modern climate research at the close of the 20th century, the concept of climate lost its temporal stability.
Instead, climate change has become a core feature of the understanding of climate and a focus of research interests. Climate
has also lost its immediate association with specific geographical places and become global. The interest is now focused on
the impact of human beings on climate. The paper attempts to investigate these conceptual shifts and their origins and impacts
in order to provide a more comprehensive perspective on the history of climate research. 相似文献
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ABSTRACT: In general beer has not been portrayed as part of a balanced diet. However, red wine has been promoted as a beneficial part of a nutritious diet. The evidence is that beer is at least the equal of wine from a nutritional perspective and in countering ailments such as coronary heart disease. This study used surveys to compare beer and wine consumers' perceptions of alcoholic and nonalcoholic beverages. The consumers ranked 7 beverages based upon perceived healthfulness both before and after they were exposed to nutritional information about the beverages. The ranked data were analyzed using analysis of variance. The variance due to the 3-way interaction of place of recruitment, beverage, and ranking was found to be significant at P < 0.05. There was no significant difference between genders. Overall, consumers of alcoholic beverages perceived red wine to be more healthful than the other 6 beverages, including beer and white wine. The perceived healthfulness of a beverage does not appear to be the main factor driving the choice of beverage. Nutritional information does impact consumers' perceptions of the healthfulness of beverages. Consumers who are predominately beer drinkers were more heavily influenced by nutritional information than consumers who were predominately wine drinkers. 相似文献
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This paper discusses a formal and rigorous approach to the analysis of operator interaction with machines. It addresses the acute problem of detecting design errors in human-machine interaction and focuses on verifying the correctness of the interaction in complex and automated control systems. The paper describes a systematic methodology for evaluating whether the interface provides the necessary information about the machine to enable the operator to perform a specified task successfully and unambiguously. It also addresses the adequacy of information provided to the user via training material (e.g., user manual) about the machine's behavior. The essentials of the methodology, which can be automated and applied to the verification of large systems, are illustrated by several examples and through a case study of pilot interaction with an autopilot aboard a modern commercial aircraft. The expected application of this methodology is an augmentation and enhancement, by formal verification, of human-automation interfaces. 相似文献