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The impact of the spectral composition of light on the discoloration of paint pigments has been investigated for the case of lead chromate sulfate, an unstable yellow pigment used by Vincent van Gogh and other painters. With LEDification, museum lighting is moving from using halogen to LED lamps. LED light sources have a significantly different spectral composition than halogen lamps. To understand the impact of these differences on pigment stability, the wavelength dependence of pigment discoloration was determined. Contrary to the expectation that lower wavelength photons induce more damage than higher wavelength ones, UV (394?nm), blue, and cyan light all lead to similar levels of discoloration of a pigment for the same level of radiant power. By understanding this wavelength dependence, it becomes possible to create white light LED lamps with a spectral composition tuned to minimize the degradation effect. An existing LED solution with a modified emission indeed resulted in 30% less color change in the experiment than halogen. Furthermore, a method is proposed to optimize the LED spectra by tuning to the properties of each specific artifact. Simulations show that this can reduce the damage of the light source by 45% in specific cases. 相似文献
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The paper reviews the literature on disciplinary credit assignment practices, and presents the results of a longitudinal study of credit assignment practices in the fields of economics, high energy physics, and information science. The practice of alphabetization of authorship is demonstrated to vary significantly between the fields. A slight increase is found to have taken place in economics during the last 30 years (1978–2007). A substantial decrease is found to have taken place in information science during the same period. High energy physics is found to be characterised by a high and stable share of alphabetized multi-authorships during the investigated period (1990–2007). It is important to be aware of such disciplinary differences when conducting bibliometric analyses. 相似文献
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J. Parker Ladwig Thurston D. Miller 《Library Collections, Acquisitions, and Technical Services》2013,37(3-4):77-84
How many monographs acquired in a particular year circulate in that year? What percentage have their first circulation each successive year? Does the pattern differ for different broad subject areas, i.e., humanities, the sciences, and the social sciences? This article tests the assumption that the first-circulation pattern differs by subject. We conclude that the pattern does not differ. The finding is important for decisions about off-site storage, assessing collection development, maintaining departmental libraries, etc. Regardless of subject, if a book has not circulated at least once within a few years after acquisition, it is unlikely to find its reader. 相似文献
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Courses: Interpersonal Communication, Health Communication, Intercultural CommunicationObjectives: After completing this semester-long activity students, should be able to (1) apply course concepts (i.e., stereotypes, identity, listening, language, and conflict) to diverse real-world scenarios; (2) explain the utility of intergroup contact theory in relationship to communication and social diversity; (3) critically reflect on social diversity explored through communication behaviors; and (4) develop communication competence toward diverse others, specifically persons with disabilities (PWDs). 相似文献
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E. A. Vasilenko T. V. Meshcheryakova E. M. Kol’tsova E. A. Dikaya 《Scientific and Technical Information Processing》2011,38(3):193-200
The existing open-source object-oriented systems that can be used as an environment to upload and to store information-educational
resources for distance learning (open-source LMS\LCMS: ATutor, Claroline, Dokeos, Sakai, and Moodle), are analyzed. The use
of Moodle (a Modular Object-Oriented Dynamic Learning Environment) as the environment for the learning portal of the Mendeleyev
University of Chemical Technology of Russia () is justified. The capabilities of Moodle with regard to the development of information-educational resources are explored
and educational materials are elaborated for a course of study, viz., “Protection of Intellectual Property,” e.g., theoretical
materials, seminar and colloquia exercises, tests for interim and final control of student’s knowledge level, as well as the
elements of a learning process management system for a course of study. 相似文献
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《Communication monographs》2012,79(4):292-301
The social skill deficit theory of depression states that a lack of social skill is related to the development of depression. However, the findings on this relationship are mixed, possibly due to a variety of variables surrounding the conceptualization and assessment of social skill, as well as the type of subjects used in these investigations. A meta‐analysis was conducted to determine the magnitude of the relationship between depression and social skill as measured by self‐reports, observer‐ratings, and behavioral assessments. The results showed moderate, but not unequivocal, support for the social skill deficit theory. Depression was most strongly related to social skill deficits when they were measured via self‐reports. Observer‐ratings and behavioral analyses of social skill revealed weaker and more sporadic relationships with depression. Several moderator variables as well as a tendency toward negative self‐evaluation in depression appear to influence these relationships. 相似文献
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Word‐of‐mouth (WOM) communication is introduced within a hierarchy‐of‐effects context. The results of a laboratory experiment suggest that amount of WOM information about products is less important than valence of that information. Counter to previous research implying a disproportionate influence of negative information on product evaluation, negative WOM information in the experiment reported resulted in less familiarity with the mentioned brand. Further, a somewhat surprising finding indicated that brand‐specific negative WOM communication can have the effect of decreasing primary demand for an entire product category. 相似文献
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Recognizing the complex interplay between country music, lifestyle, and identity, and the disparate nature of these texts and their producers, we center our analysis of the politics of contemporary “country” in the accounts of country music listeners. Through this lens, “country” foregrounds a portrait of precarious labor and white rural economies. Precarity is held up as aspirational, facilitated by the relative structural support of whiteness and masculinity that simultaneously leverages economic hardship to obfuscate these privileged positions. “Country” elides experiences of class marginalization, white rurality, and masculinized labor with mythologized narratives that position simplicity and work as “the good life.” 相似文献
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L. A. Mosunova 《Scientific and Technical Information Processing》2017,44(3):175-183
This paper sets the problem of development of information culture and advances the hypothesis about understanding of the meaning of information as its basis. Five ideas related to the problems of the paper are distinguished in the theory of understanding. The paper describes the concept of adequate and inadequate understanding the meaning of information and develops the criteria of understanding the meaning of information. The concept of the “understanding of the meaning of information” is defined. 相似文献
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《Communication monographs》2012,79(3):210-235
The primary aim of this paper is to identify cross‐cultural similarities and differences in people's implicit theories of requesting. Implicit theories are conceptualized as containing information about five interactive constraints that influence choices about requests: (1) Clarity, (2) Perceived imposition, (3) Consideration for the other's feelings, (4) Risking disapproval for self, and (5) Effectiveness. The paper compares how these five constraints are perceived and rated across cultures and traces possible links between the constraints and perceptions of the likelihood of using various request strategies. Participants are a total of 595 undergraduates: 296 Koreans (native speakers of Korean) and 299 Americans (native American English speakers) studying in their respective countries. After reading a hypothetical request situation, participants evaluated request strategies along the five constraint dimensions as well as for likelihood of use. The rank‐ordering of the request strategies along the dimensions were similar across cultures except for effectiveness of strategies. Striking cross‐cultural differences were found in the rank and mean strategy ratings for effectiveness judgments: U.S. participants considered the direct statement strategy as the most effective way of making a request, while Korean participants rated it as the least effective strategy. Regarding the incompatibility among interactive constraints, U.S. participants saw clarity to be closely related to effectiveness of strategies; for Korean participants clarity of strategies was counterproductive to effectiveness. Theoretical and practical implications of these findings are discussed. 相似文献
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库切的代表作《耻》一直得到了来自学术界的广泛关注。与以往的论文研究该作中《耻》的表现不同,本论文尝试揭示主人公通过救赎而表现出荣耀的一面。本文分为两方面：主人公对女儿的爱和自己对性的虚荣心的瓦解。 相似文献
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Wu Weici Luo Zhiyong 《图书情报工作》1996,40(4):29-34
Since1980s,Chinahasmadegreatprogressinthetheoreticalresearchoflibraryscience.Themostim-portantcharacteristicsmaybedescribedasfollows: ·Thelibraryscienceresearchhascometoevadebeinglimitedonlytodescribeexperimentallythecon-creteworkinthelibrary,andpaymoreandmoreattentiontotheconnotationandtheoreticalsystemofthediscipline; ·Ithascomeoutofthemicro-worldofthelibrary,andbeenspeculatingabouttheactualmacro-prob-lemsbothundertheperipheralenvironmentandinthesociety; ·Ithasintroducedmanyachi… 相似文献
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Elizabeth A. Suter Leslie A. Baxter Leah M. Seurer Lindsey J. Thomas 《Communication monographs》2014,81(1):59-78
Framed by relational dialectics theory, discursive constructions of the meaning of “family” were examined in 100 online foster adoption narratives. Parental narratives manifested struggles between biogenetic and discursive constructions of “family,” identified here as the discourse of biological normativity (DBN) and discourse of constitutive kinning (DCK). The DBN reinscribes the dominant cultural and foster care system preference for biogenetically connected families. The DCK resists the DBN, maintaining that enacted behaviors and shared affections, rather than shared genetics, constitute legitimate families. Contrapuntal analysis revealed a high degree of polemic interplay; both discourses competed to be centered rather than marginalized through the discursive practices of negating, countering, and entertaining. Implications for theorizing definitions of family and studying families in context are discussed 相似文献
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《Communication monographs》2012,79(4):279-287
This paper identifies the essential characteristics of victimage rhetoric in American justifications for war. The Johnson administration's insistence on the aggression‐from‐the‐North thesis is the starting point for the analysis. Close inspection of the administration's efforts reveals that the enemy is portrayed as a savage, i.e., an aggressor, driven by irrational desires for conquest, who is seeking to subjugate others by force of arms. This image of the enemy is intensified by a contrasting image of the United States as a representative of civilization who is rational, tolerant of diversity, and pacific. Further investigation confirms that the contrasts of force vs. freedom, irrationality vs. rationality, and aggression vs. defense permeate the substance and style of the call‐to‐arms throughout American history. They provide the internal dynamic which integrates recurrent form into a genre of rhetorical discourse. 相似文献