1,724,151 research outputs found
[Missouri Pacific Lines, Engine Drawing Card, Sketch No. 7988]
No full textThis engine drawing card was created for Missouri Pacific Railroad Company, Class 14-50 2/4 E. Section J-14 1/4 E. Sketch 7988. Copy Spec.Ry. Co's. Spec. dated May 7, 1928 for 2-8-4
The efficacy of RH-7988 against green peach aphid (Myzus persicae (Sulzer)) and cabbage aphid (Brevicoryne brassicae (L.)) on cabbages.
Full text linkGreen peach aphid (Myzus persicae (Sulzer))and cabbage aphid (Brevicoryne brassicae (L.)) are pests of brassicae due to their ability to reduce the quantity and quality of yield through direct and indirect damage. Problems with resistance to current aphicides and consumer demand for selective pesticides has led to the need for new aphicides. Towards this end, field and laboratory experiments were set up to compare a novel aphicide (RH-7988) with a currently registered aphicide (pirimicarb), for aphid control in cabbages.
Three field trials were conducted using a 5x5 latin square design. The number, size and species of aphid colonies per plant was recorded at intervals after treatment. In laboratory experiments the LC50 and temperature/toxicity relationships of RH-7988 and pirimicarb were determined using aphids treated on leaf discs. To investigate the residual activity of RH-7988 aphids were caged on to treated cabbages and mortality was assessed 24 and 48 hours after treatment. The toxicity of RH-7988 to several natural enemies was determined by exposing insects to fresh (wet) spray residues.
No phytotoxic effects were recorded on cabbages sprayed With RH-7988 plus surfactants (Triton B1956, Triton AG98, Sunspray 6E and Citowett). RH-7988 was equivalent to pirimicarb in controlling aphids on cabbages in the first 14 days after treatment (aphid populations were < 20% that of the control treatment). After this time (up to 35 days after treatment) aphid populations on RH-7988 treated plants were, on average, 38% that of populations on plants treated with pirimicarb.
There was no significant difference between the LC50 values of both aphicides when tested against each aphid species. The toxicity of RH -7988 to the two aphid species did not change significantly between 10 and 300C and were not significantly different to pirimicarb. The aphicides had a significant residual effect (cf. control treatment) on cabbage aphid and green peach aphid for 5 and 10 days after treatment, respectively. RH-7988 also reduced aphid numbers on leaves that emerged subsequent to aphicide application (between 18 and 23 days after treatment). The recommended field rate of RH-7988 (100 g a.i./ha) was more toxic towards the two aphid species (100% mortality) than to several natural enemy species and life stages (corrected means ranging from 0-59.3%).
RH-7988 has good potential to be included as a aphicide for use on brassicas.
Excellent control is achieved for periods longer than pirimicarb and RH-7988 is selectively more toxic to aphids than to some of their common natural enemies
Linked collectors and determiners for: The genus Anisoscelis Latreille (Hemiptera: Heteroptera: Coreidae: Coreinae: Anisoscelini): new species, taxonomical arrangements, distributional records and key.
No full textNatural history specimen data linked to collectors and determiners held within, "The genus Anisoscelis Latreille (Hemiptera: Heteroptera: Coreidae: Coreinae: Anisoscelini): new species, taxonomical arrangements, distributional records and key". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/0f68b3cc-7988-47c3-9061-26f5b311ba60">https://bionomia.net/dataset/0f68b3cc-7988-47c3-9061-26f5b311ba60</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/0f68b3cc-7988-47c3-9061-26f5b311ba60">https://gbif.org/dataset/0f68b3cc-7988-47c3-9061-26f5b311ba60</a>. Formatted as a Frictionless Data package
Linked collectors and determiners for: The genus Anisoscelis Latreille (Hemiptera: Heteroptera: Coreidae: Coreinae: Anisoscelini): new species, taxonomical arrangements, distributional records and key.
No full textNatural history specimen data linked to collectors and determiners held within, "The genus Anisoscelis Latreille (Hemiptera: Heteroptera: Coreidae: Coreinae: Anisoscelini): new species, taxonomical arrangements, distributional records and key". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/0f68b3cc-7988-47c3-9061-26f5b311ba60">https://bionomia.net/dataset/0f68b3cc-7988-47c3-9061-26f5b311ba60</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/0f68b3cc-7988-47c3-9061-26f5b311ba60">https://gbif.org/dataset/0f68b3cc-7988-47c3-9061-26f5b311ba60</a>. Formatted as a Frictionless Data package
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
A practical look at delivering assessments to BS 7988 recommendations
Full text linkBS 7988 is the new British Standard Code of practice for the use of information technology (IT) for the delivery of assessments. It was developed by a panel of experts in the field of computerised assessment. They included representatives from government, business, education and exam boards.
The BS 7988 standard itself is being covered in another session at the conference. This paper addresses how Questionmark Perception users can use Perception to be compliant with the standard.
You can get a copy of the document from the British Standards Institution (www.bsi-global.com). It introduces guidelines and requirements for any organisation that uses computers to create assessments. It also explains how organisations can establish a good code of practice for delivering them.
To comply with the new standard, organizations running exams need to have effective methods to verify online candidates who may be at remote locations. The publication also gives guidelines on providing practice tests for candidates, taking mandatory breaks from the screen, and preventing screen-snooping, cribbing work, sending emails, and accessing websites.
This paper will explain how authors and administrators can use Questionmark Perception in the correct way to enable them to follow the various technical recommendations in the standard. It explains that compliance with the standard is not simply a matter of installing the software. Rather, recommendations on using the software must be followed, both on procedural and technical issues. In fact Questionmark has contributed a key part in developing the standard. Managing director John Kleeman also stood as the BSI committee chairman
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
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