117,952 research outputs found
Fig. 3. L in A New Stonefly From Lebanon, Leuctra Cedrus Sp. N. (Plecoptera: Leuctridae)
No full textFig. 3. L. cedrus sp. n.: female subgenital plate in ventral view.Published as part of Vinçon, Gilles, Dia, Aref & Sivec, Ignac, 2014, A New Stonefly From Lebanon, Leuctra Cedrus Sp. N. (Plecoptera: Leuctridae), pp. 1-5 in Illiesia 10 (1) on page 4, DOI: 10.5281/zenodo.476108
A novel triple-diameter pulsating heat pipe: Flow regimes and heat transfer performance
No full textA single-turn triple-diameter pulsating heat pipe (TD-PHP) with a total length of 250 mm (the evaporation, adiabatic, and condensation lengths were 25 mm, 125 mm, and 100 mm, respectively) made of a transparent Pyrex glass was designed and fabricated for the first time. The thermal performance and flow characteristics of the TD-PHP were compared with two other fabricated PHPs, the single-diameter (SD) and dual-diameter (DD) PHPs, to determine the effect of non-uniform channel diameters. The PHPs were mounted on a tilting frame, and their thermal performances were tested with various heat inputs, inclination angles, and filling ratios. The temperatures of the evaporation, condensation, and adiabatic sections and flow behaviors were monitored. Results indicated that circulating flow was enhanced by using TD-PHP, and thermal resistance was reduced considerably. The visualization results showed that the bubbles' generation, growth, and breakage leading to enlarged vapor plugs were enhanced because of the unbalanced gravitational forces owning to the channel with non-uniform diameter. Hence, the TD-PHP was functional even at inclination angles near the horizontal angle
Performance of Leucaena leucocephala and Albizia lebbeck trees under low irrigation water in the field
No full textGrowth of Leucaena leucocephala and Albizia lebbeck trees was investigated under
low water supply in the field using a complete randomized block design at the
Research and Experiments Station of the College of Food Science and Agriculture,
Riyadh, Saudi Arabia. The trees were irrigated at either 160 (well water supply) or
500 mm (low water supply) of a class "A" evaporation-pan records for two years.
Differences were occurred between L. leucocephala and A. lebbeck trees across
irrigation treatments with greater values for L. leucocephala in most of the growth
characteristics measured. Comparing with L. leucocephala, leaves of A. lebbeck
comprises only small proportion of the total weight of tree while allocated equal
proportions to their branches and roots (41%).while L. leucocephala trees allocated
almost similar proportions to their branches, stem and roots (27-28%). Low water
supply decreased stem by 19.5% with stem diameter was unaffected. Leaf, branches,
stem, root and consequently total dry weight of the trees decreases by 42, 51.5, 45, 51
and 94% in low water supply. However, the performance of L. leucocephala and A.
lebbeck trees endured low irrigation conditions in terms of survival and maintaining
reasonable growth.Corresponding Author:
Prof. Ibrahim Mohammed Aref
Plant Production Department, College of Food Science and Agriculture, King Saud University, P.O. Box 2460 Riyadh 11451 Saudi Arabia.
Email: [email protected]
Effects of pre-germination treatments and sowing depths upon germination potential of some Acacia species
No full textSeeds of Acacia farnesiana (L.) Willd., A. salicina Lindley, A.
nilotica (L.) Willd. ex Del., A. ehrenbergiana Hayne, A. seyal Del., A.
saligna (Labill.) H. L. Wendl. and A. tortilis (Forssk.) Hayne were
subjected to pre-germination treatment. This was either by soaking
seeds in water for 24 or 48 or 72 hours or by placing them in boiling
water and left them to cool to the room temperature. All seeds were
sowed either at 2 or 4 or 6-cm at soil. The higher germination
percentage for all Acacia species was obtained after boiling seeds in
water and at 2-cm sowing depth apart from A. ehrenbergiana. It
showed no response to boiling in water but had the best result with
soaking in water for 24h. The results of this study suggest that boiling
seeds of the investigated Acacia species in water is recommended with
sowing depth not deeper than 4 cm.Corresponding Author:
Dr. Ibrahim Mohammed Aref
Department of Plant Production, College of Agriculture, King Saud University,
P. O. Box 2460 Riyadh 11451, Saudi Arabia
Email: [email protected]
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
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
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
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
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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