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Search Results: 1 - 10 of 299666 matches for " J?rn Altmann "
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The RP-Index and the CP-Index for Evaluating the Productivity of Researchers and their Communities
Jrn Altmann,,Alireza Abbasi,Junseok Hwang
International Journal of Computer Science & Applications , 2009,
Abstract:
Industrial Progress: New Energy-Efficient Absorbents for the CO2 Separation from Natural Gas, Syngas and Flue Gas  [PDF]
Jrn Rolker, Matthias Seiler
Advances in Chemical Engineering and Science (ACES) , 2011, DOI: 10.4236/aces.2011.14039
Abstract: The CO2 separation from natural gas, syngas or flue gas represents an important industrial field of applications. An economic and energy-efficient CO2 separation from these gas streams is a prerequisite for sustainable industry contributions to the megatrends resource efficiency and globalization of technologies. One way of reducing operational expenditure for these separation processes is the development of better performing CO2 absorbents. Although a number of absorbents for the separation of CO2 from process gas streams exist, the need for the development of CO2 absorbents with an improved absorption performance, less corrosion and foaming, no nitrosamine formation, lower energy requirement and therefore less operational expenditure remains. Recent industrial activities have led to the development of novel high-performance CO2 scrubbing agents that can be employed in numerous industrial processes such as natural gas treatment, purification of syngas and the scrubbing of flue gas. The objective of this paper is to introduce these new high-performance scrubbing agents and to compare their performance with other state-of-the-art absorbents. It turned out, that the evaluated absorbents offer high cyclic capacities in the range of 2.4 to 2.6 mol CO2/kg absorbent and low absorption enthalpies (–30 kJ/mol) allowing for distinctive savings in the regeneration energy of the absorbent. Calculations with the modified Kremser model resulted in a reduction of the specific reboiler heat duty of 55%. Furthermore, the absorbents are less corrosive than standard amines as indicated by the measured corrosion rates of 0.21 mm/y versus 1.18 mm/y for a piperazine/methyldiethanolamine mixture. Based on new experimental results it is shown how substantial savings in operational and capital expenditure can be realized due to favorable absorbent properties. The novel high-performance CO2 system solutions meet recent industrial absorbent requirements and allow for more efficient or new CO2 separation processes.
High-Level Language Production in Parkinson's Disease: A Review
Lori J. P. Altmann,Michelle S. Troche
Parkinson's Disease , 2011, DOI: 10.4061/2011/238956
Abstract: This paper discusses impairments of high-level, complex language production in Parkinson's disease (PD), defined as sentence and discourse production, and situates these impairments within the framework of current psycholinguistic theories of language production. The paper comprises three major sections, an overview of the effects of PD on the brain and cognition, a review of the literature on language production in PD, and a discussion of the stages of the language production process that are impaired in PD. Overall, the literature converges on a few common characteristics of language production in PD: reduced information content, impaired grammaticality, disrupted fluency, and reduced syntactic complexity. Many studies also document the strong impact of differences in cognitive ability on language production. Based on the data, PD affects all stages of language production including conceptualization and functional and positional processing. Furthermore, impairments at all stages appear to be exacerbated by impairments in cognitive abilities. 1. Introduction The current paper focuses on high-level, complex language production in Parkinson’s disease (PD), in which “high-level, complex language” is defined as production of language at the sentence- or discourse-level in contrast to single-word production. In comparison to the extensive literature on motor impairments affecting articulation and intelligibility of speech (e.g., [1–6]) and neuropsychological reports of impaired picture naming and verbal fluency in PD [7–13], the literature on complex language production is somewhat limited. However, those few reports converge on a few common themes. First, while information content has been assessed in a variety of ways, including clinical judgment [14], correct information units [15], propositional content [16], or specific mention of the actors in a picture and an appropriate action [17], the findings uniformly support reduced information content. Second, although examined in only a few studies, fluency seems to be impaired [17–19]. Interruptions of fluency take many forms, including abandoned utterances, long pauses between or in the middle of sentences, or filled and unfilled pauses. The studies agree that disruptions of fluency can be attributed to difficulties in the early stages of language production (e.g., conceptualization and formulation) as well as problems during motor programming and articulation [17–19]. Third, grammaticality has also been reported to be impaired [15–17, 20]. Finally, syntactic complexity may also be impaired although this
Spatial Competition between Health Care Providers: Effects of Standardization  [PDF]
Bj?rn A. Kuchinke, Jürgen Zerth
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.53043
Abstract: In the international health care literature the impacts of competition in health care markets are discussed widely. But aspects of standardization in regional health care markets with no price competition received comparatively little attention. We use a typical Hotelling framework to analyze a regional health care market with two health care providers competing in (vertical) quality after the scope of medical treatment has been set (horizontal quality). We conclude that in the basic model both health care providers will use vertical quality to separate from each other. In the next step we introduce a standard in vertical quality of which one health care providerthe standard profiteer—could better cope with. In the standardization case a more homogeneous supply can be expected and there is a higher possibility that the standard follower has to leave the regional health care market. Therefore standardization of health care quality could strengthen monopolistic tendencies.
Online User Feedback in Early Phases of the Design Process: Lessons Learnt from Four Design Cases
Asbj?rn F?lstad,Jrn Knutsen
Advances in Human-Computer Interaction , 2010, DOI: 10.1155/2010/956918
Abstract: Online user feedback, collected by means of internet survey tools, is a promising approach to obtain early user feedback on concepts and early prototypes. In this study, the collection and utilization of online user feedback was investigated in four design cases: all master student projects for industry clients involving seven student designers. A total of 272 user participants provided quantitative feedback. Half of these also provided qualitative feedback. One third of the qualitative feedback was perceived as useful by the student designers. The main usefulness of the feedback was related to strategic concept decisions rather than the interaction design of the early prototype. Lessons learnt are provided. 1. Introduction It is well established, for example, within the field of Human-Computer Interaction (HCI), that the early involvement of users in the design process is a key to developing solutions that satisfy user needs and requirements. In particular, it is held that early involvement of users is particularly important in order to avoid costly redesign at later stages of development. One way to facilitate such early user involvement is related to concept development and early prototyping, where user feedback is collected in response to low-fidelity representations of solutions in the early stages of design. However, obtaining user feedback on concepts and early prototypes is resource demanding. In particular, this is due to having user representatives participate individually, or in small groups, in face to face (FtF) feedback sessions. High resource demands are likely to imply that user feedback is conducted at longer intervals and later in the design process than would be the case if the resource demands were lowered. Also, as the number of user participants affects the time and cost associated with running an evaluation, sample sizes are likely to be kept small. Small samples are prone to biases and therefore increase the risk that the participants are not representative of the intended user group. Online collection of user feedback may represent a way to counter the challenges of resource demands and sample sizes in early phases of design. In order to explore this, we studied online collection of user feedback in four cases of concept design and early prototyping. In each of the cases, the user feedback was collected as part of a project returning concepts and user interface (UI) visualizations for novel social media services. All four design projects were conducted in the design phase preceding technical development, as described by Buxton
Estimating Vaccine Coverage by Using Computer Algebra
D. Altmann,K. Altmann
Mathematics , 1998,
Abstract: The approach of N. Gay for estimating the coverage of a multivalent vaccine from antibody prevalence data in certain age cohorts is improved by using computer aided elimination theory of variables. Hereby, Gay's usage of numerical approximation can be replaced by exact formulas which are surprisingly nice, too.
A Simple Method for Synthesis of Active Esters of Isonicotinic and Picolinic Acids
Jrn B. Christensen
Molecules , 2001, DOI: 10.3390/60100047
Abstract: A method for preparation of the p-nitrophenyl-, N-hydroxysuccinimidyl- and pentafluorophenyl esters of isonicotinic and picolinic acids from the corresponding acids is reported.
Arte, conhecimento geográfico e leitura de imagens: O geógrafo, de Vermeer
Seemann, Jrn;
Pro-Posi??es , 2009, DOI: 10.1590/S0103-73072009000300004
Abstract: the painting the geographer by the dutch artist johannes vermeer is an image that is frequently selected as a cover for geography books. drawn in the second half of the 17th century, the picture must not only be considered as a portrait of how to think and do geography at that time; it can also be seen as a piece of art with a heavy symbolic load to stimulate a methodological debate on geographic readings of images. the present text aims to reflect about the languages of this painting, considering its sociocultural, economic and political contexts and its relation to the different processes of constructing geographic knowledge.
Insulin Resistance—a Link Between Inflammation and Hepatocarcinogenesis?
J rn M. Schattenberg
Clinical Medicine Insights: Endocrinology and Diabetes , 2012,
Abstract: The incidence of hepatocellular carcinoma (HCC) is increasing world wide. The risk factors for the development of HCC include liver cirrhosis, chronic alcohol intake, and chronic viral hepatitis. These conditions are associated with inflammation, liver cell injury, and oxidative stress. The signaling pathways that contribute to liver cell injury have been shown to also promote insulin resistance in hepatocytes. On the other hand, obesity and diabetes have been suggested as risk factors for the development of chronic liver disease and HCC. The molecular mediators (e.g. stress kinases) and signaling pathways that contribute to cellular injury, proliferation and insulin resistance are also activated in chronic liver disease. At this time it is still unknown whether (1) IR will help to identify patients that are of increased risk for progressive liver disease or (2) if improving IR will be beneficial to patients with chronic liver disease. Future research will have to expand our knowledge on mediators of inflammation and liver cell injury within clinical trials to establish whether IR should be included in every hepatologists work up as a cofactor for chronic liver disease.
Pressure sores in spinal cord injury: Active intervention saves costs
RN Dunn, J Stander
Southern African Journal of Critical Care , 2008,
Abstract: Summary. Pressure sores are a predictable consequence of poorly managed spinal cord-injured patients. Not only do pressure sores contribute to the morbidity, but also add significantly to the medical/nursing management, cost and admission stay, limiting optimal bed utilisation. This intervention study assesses the impact of active intervention in terms of pressure-relief mattresses, establishment of a ‘turning team' and medical/nursing staff education on pressure sore incidence, extended stay and associated costs. Results. The de novo incidence reduced from 16% to nil once the interventions were in place, with an annualised estimated saving of R738 239, or R4 732 per cervical spine-injured patient admitted. Conclusion. Active intervention costs are well justified by the cost saving in terms of reduced extended stay days. The routine use of pressure-relieving mattresses and a turning team in the management of spinal cord injuries is recommended. Southern African Journal of Critical Care Vol. 24 (1) 2008: pp. 8-12
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