1,721,030 research outputs found
Element content of moss as possible air pollution indicator around renewable energy plant / Zaliana Mohd Kanafi
Full text linkThe study was conducted to determine the pollution level of heavy metals surround the
Jengka Renewable Energy Plant at Jengka 9 based on the concentration of metals deposited
in the moss samples as bioindicator. The twelve samples of moss were collected from three
locations where each of location has different distances from plant center ; 50m, 100m, 150m,
and 200m. The sampling technique and sample treatment were done based on the standard
procedures that had applied by other researcher. The total concentration of Fe, AI, Zn, Cu
and Cr were analyzed by using ICP-OES after an acid digestion with hot plate. The mean
concentration of metals was 3080.92mg/kg for Fe, 1095.47mg/kg for AI, 53.22mg/kg for Zn,
31.90mg/kg for Cu and 6.88mg/kg for Cr and were ranked in increment order of Fe > Al >
Zn > Cu > Cr. The study was found that at distances 50m and 100m had the highest
concentration of metals compared to other distances. Three pollution indices; contamination
factor (CF), enrichment factor (EF) and pollution load index (PLI) were used to evaluate the
level of contamination of these metals. The values of EF found in this study clearly showed
that the high concentration of metals in moss samples were contributed by anthropogenic
activities which expected influenced by the nearby industrial site and transportation. The
observed PLI value clearly indicated that the environment surrounding Jengka Renewable
Energy Plant was polluted by the studied metal. In general, based on the correlation data, it
could be concluded that all the metals (Fe, AI, Cu and Cr) would be originated from the same
sources except for metal of Zn
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
Rocky road – surface roughness impacts on rubber friction
No full textRubber friction is a topic of great importance for tyre/road friction. Tyre manufacturers and road authorities are striving to improve the friction between tyre and road pavement, without sacrificing other design parameters. Despite advancements in the rubber friction theories, yet, they cannot adequately predict friction even in laboratory tests. This arises from the complexity of filled rubbers, the multi-scale road surface roughness and the partial contact of the tyre with the road.
This dissertation aims to improve the current understanding about surface roughness impacts on rubber friction. A field experiment reported actual macro- and micro-roughness variations of road surfaces. Applicability of surface roughness power spectrum (PSD) as a roughness characterisation technique was evaluated for tyre/road friction studies. Top topography PSD was employed to characterise roughness only on the positive texture, where tyre meets road. Unique potential of three-dimensional (3D-) printing technology for tyre/road friction studies was introduced. Randomly rough fractal surfaces with different macro-roughness were 3D-printed for rubber friction tests. Measurements were performed at various sliding velocities, temperatures and with different rubber compounds. Results were compared to the predictions of viscoelastic friction to address sources of uncertainties in the friction prediction.
Based on the field experiment, the full surface topography of pavements undergoes changes in macro- and micro-scale. Hence, the PSD calculated from the full surface topography cannot show the real connection between surface roughness and friction. However, when top PSD was used for surface characterisation, a strong correlation was found between the friction and the roughness, but only at short-scale surface roughness. It was concluded that rubber penetration depth onto each pavement is a necessary pre-knowledge for finding meaningful relation between friction and longer wavelengths. Using 3D-printed substrates, for the first time, effect of macro-roughness on dry rubber friction was confirmed experimentally. Macro-roughness tended to reduce rubber friction. Yet, the magnitudes of the impacts were dependent on the test conditions. Based on the experiments, the friction variations as a function of the velocity exhibited a "bell curve" shape over 6 velocity decades. Measurements showed that the friction-velocity curve shifted roughly by one decade in velocity for 15°C reduction in temperature. Two main sources of uncertainties in the friction prediction were identified as I. inadequate knowledge about the large strain viscoelastic modulus of rubbers, and II. difficulty in determining the short-wavelength cut-off q1 of the surface roughness. Macro-roughness effects seem to be more visible when the hysteresis friction along with the frictional heating, are the dominant phenomena.
The research results have direct relevance for tyre/road friction, particularly for road surface roughness characterisation and fundamental studies about roughness impacts on rubber friction
IMPLEMENTASI KEBIJAKAN REGROUPING PADA SEKOLAH DASAR NEGERI 1 KARANGLO LOR DESA KARANGLO LOR KECAMATAN SUKOREJO KABUPATEN PONOROGO
Full text linkABSTRACT
IMPLEMENTATION OF REGROUPING POLICY AT THE STATE SCHOOL 1
KARANGLO LOR VILLAGE KARANGLO LOR SUKOREJO DISTRICT
PONOROGO DISTRICT
Imam Kanafi
NIM. 18221692
The birth of the elementary school regrouping policy in Ponorogo Regency based
on the Regulation of the Minister of National Education and Culture Number 15 of 2010
concerning Minimum Service Standards for Basic Education in Regency/City. The
standard for a school having 6 classes should beminimum number of students is 120
people with one class of at least 20 people. Thus, if an elementary school has 6 classes, it
must have at least 120 students. In fact, in the Ponorogo area, field data indicate a
shortage of students in almost all elementary schools.
This research uses a qualitative approach, namely the type of in social science
which is fundamentally dependent on observations of humans both in its area and in its
terminology (Moleong, 2016: 4). From the results of data analysis, it was found that the
first step taken by the Education Office of Ponorogo Regency in the context of
implementing the regrouping policy was to collect data on the condition of elementary
schools. This data collection is carried out by the sub-district school elimination and
merger team.
Policy socialization in the area of the Ponorogo District Education Office is carried
out in two ways, namely panel discussions and hearings between the elimination and
merging teams of district and sub-district schools with target schools (principals,
teachers), school committees, and school stakeholders (local village administrations). ,
parents/guardians of students, community leaders).
School mergers are carried out by planning students, teaching staff, infrastructure,
parent schools, and school committees determined by the school merger team. In
implementing the regrouping policy, the Education Office has a special team that handles
it.
Although the evaluation of the regrouping program shows the achievement of the
objectives of the regrouping program. The fulfillment of the minimum education
standards can be met, the efficiency of education financing can be achieved, the
effectiveness of education implementation is achieved, and the quality of education in
Ponorogo Regency, especially for elementary schools, is increasing. Although the
regrouping program has shown positive results, there are still many shortcomings in the
process, namely the absence of uniform evaluation guidelines in one district and
evaluation activities tend to overlap with monitoring activities
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
- …
