186,245 research outputs found
Fabrication of high temperature surface acoustic wave devices for sensor applications
No full textSurface acoustic devices have been shown to be suitable not only for signal processing but also for sensor applications. In this paper high temperature surface acoustic wave devices based on gallium orthophosphate have been fabricated, using a lift-off technique and tested for high frequency applications at temperatures up to 600 ºC. The measured S-parameter (S11) has been used to study the mass loading effect of the platinum electrodes and turnover temperature of GaPO4 with a 5? cut. The analysis of these results shows that the mass loading effect can be used to predict the desired resonant frequency of the SAW devices. Also two different adhesion layers for Pt metallisation were studied. Our results show that Zirconium is a more suitable under layer than Titanium
Simultaneous determination of ferulic, caffeic and p-coumaric acid in plant samples with liquid chromatography
No full textDoločali smo vsebnosti ferulne kisline, kavne kisline in p-kumarne kisline v vzorcu rdečega grozdja, v trgovsko dosegljivem rožmarinovem ekstraktu in v trgovsko dosegljivem ekstraktu zelene kave. Preiskovane kisline smo določali s tekočinsko kromatografijo visoke ločljivosti z UV zaznavo. Za ločevanje spojin smo uporabili izokratsko elucijo, kjer smo kot mobilno fazo uporabili mešanico metanola, vode in ocetne kisline v volumskem razmerju 15:80:5. Spojine v ekstraktih smo potrdili s primerjavo retenzijskih časov standardov, kvantifikacijo pa smo izvedli na podlagi umeritvenih krivulj. Linearnost metode je bila za vse preiskovane kisline potrjena v koncentracijskem območju 1,0–100,0 mg/L.
Vzorce smo pripravljali z različnimi postopki ekstrakcij (ekstrakcija tekoče-tekoče, ekstrakcija trdno tekoče z etilacetatom v Soxhletovem aparatu in s pomočjo ultrazvoka, ekstrakcija po kislinski hidrolizi in ekstrakcija po alkalni hidrolizi vzorcev). Najvišje vsebnosti preiskovanih spojin v rdečem grozdju so bile določene z ekstrakcijo po kislinski hidrolizi vzorcev kot tudi po ultrazvočni ekstrakciji. V vzorcu rožmarinovega ekstrakta in ekstrakta zelene kave preiskovanih kislin nismo zaznali.The contents of ferulic acid, caffeic acid and p-coumaric acid in samples of red grapes, commercially available rosemary extract and in commercially available green coffee extract were determined. The tested acids were determined by high performance liquid chromatography using UV-detection. An isocratic elution was used for the separation of the compounds. A mixture of methanol, water, and acetic acid in volume ratio of 15: 80: 5 was used as the mobile phase. The compounds in the extracts were confirmed by comparing the retention times of standards, and the quantification was performed on the basis of calibration curves. The linearity of the method for all acids was confirmed in the concentration range of 1.0-100.0 mg/L.
The samples were prepared by various extraction processes (liquid-liquid or solid-liquid extraction with ethyl acetate in the Soxhlet apparatus or in an ultrasound bath, extraction with acid hydrolysis, and extraction with alkaline hydrolysis of the samples). The highest contents of the investigated compounds in red grapes were determined by extraction with acid hydrolysis of the samples as well as after ultrasonic extraction. The investigated acids were not detected in samples of rosemary and green coffee extract
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Reviving spirit in corporate systems
No full textThe underlying context of this work is the mismatch between the systems that we need to comply with and what our spirit and intuition wants and needs. The thesis questions the relevance of spiritless corporate systems set up to serve the 'best interest' of human beings and other living things. Corporate systems have been established to comply with governing laws, to facilitate transaction of money and provide financial accountability to stakeholders and clients - spiritless matters. Corporate systems are ill equipped to protect our emotional and spiritual boundaries, our tangible and intangible links to the past and to the future. Spirit, which is the essence of life, is often not understood, discussed or included in the planning, development and implementation of the very systems that govern and impact on our lives and our communities. If spirit is included it is often well intended but rhetorical. Spirit needs to be revived and provided time, place and purpose, not only in our broader lives but also in our work cultures. Without spirit, facts have no meaning or relevance to life.
This thesis searches for solutions to fill this spiritual gap in corporate systems, drawing on the experiences and lessons gained through engaging with communities and corporate systems in Australian and international contexts. The search covers a study of oral tradition(spirit),the impact of the lack of credibility afforded to oral tradition, developing and trialling common-ground terminology and frameworks befitting both corporate and spiritual systems across different industry sectors, the isolation of arts and culture from other sectors, the role of community development arts practices, and aspects of social science and urban development theories.
The research traces the development and implementation of a cultural planning program for Western Australia through policy development at State government level and then framework development undertaken through Community Arts Network WA. The development of this cultural planning program draws on the contribution of diverse industry sector partners and this thesis research explains how their perspectives can contribute to the revival of spirit in corporate systems. The partnerships involved are business planning, town planning, community psychology, vocation, education and training, and sustainability.
Having contributed to the development of the broader frameworks for the implementation of cultural planning across the State and beyond, this research delves further into addressing the issue of reviving spirit in corporate systems through refining the First (spirit) and Third Person (corporate) approach to cultural planning. This method is based on a key Spirit Catalyst called The First and Third Person Systems. This key Spirit Catalyst provides a guide for balance between spirit and corporate systems. There are a total of seven secondary Spirit Catalysts cited. Comparisons and contrasts between First and Third Person cultural planning process and strategic planning are provided. Principles and protocols and tools for evaluating spirit have been developed as part of the process. In keeping with the first person nature of spirit, personal narrative is used wherever possible to give life and meaning to facts and other planning and management processes
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
High-temperature 434 MHz surface acoustic wave devices based on GaPO<sub>4</sub>
No full textResearch into surface acoustic wave (SAW) devices began in the early 1970s and led to the development of high performance, small size and high reproducability devices. Much research has now been done on the application of such devices to consumer electronics, process monitoring and communication systems. The use of novel materials such as gallium phosphate (GaPO4), extends the operating temperature of the elements. SAW devices based on this material operating at 434 MHz up to 800C, can be used for passive wireless sensor applications. Interdigital transducer (IDT) devices with Platinum/ Zirconium metallization and 1.4 micron finger-gap ratio of 1:1 have been fabricated using direct-write e-beam lithography and a lift-off process. The performance and long term stability of these devices has been studied, and the results are reported in this paper
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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