1,720,965 research outputs found
Project Stream Stream Flow Data
No full textStream flow data for Project Stream was recorded in the summer of 2016, with several measurements taken across the span of the stream on a roughly weekly basis throughout the summer months.Summer 201
Project Stream Soils Data
No full textSoil properties -
Soil data have been collected at Project Stream each summer from 2014-2016. Data were collected using the same quadrat system utilized for vegetation cover data. The dataset includes denitrification potential, microbial biomass C, respiration, soil NO3, soil NH4, soil TIN, microbial biomass N, mineralization potential, nitrification potential, soil moisture, soil organic matter, bulk density, pH, soil temperature, and redox. Most variables are located in the Project Stream Soil Data_MasterSheet.xlsx file. Additional data for pH, soil temperature, redox are located in the ProjectStreamGHGData_MasterSpreadsheet.xlsx file.
Greenhouse gas data -
Measures of greenhouse gas emissions from the soil have been collected at Project Stream each summer from 2015-2016. Data were collected using the same quadrat system utilized for vegetation cover and soil properties data. The dataset includes soil moisture, headspace measures to indicate the volume of the chamber being sampled, whether there was standing water on site, site temperature, and fluxes of CH4, CO2, and N2O. These data are stored in the ProjectStreamGHGData_MasterSpreadsheet.xlsx file.Annual data 2014-201
Project Stream Vegetation Data
No full textVegetation cover -
Vegetation cover data have been collected at Project Stream consistently each summer from 2014-2016. Data were collected using a quadrat system, as laid out on the attached diagram. The dataset includes cover class data, assigned using the Braun-Blanquet Cover Estimate Scale. For each quadrat, researchers estimated cover of features (grasses, forbs, ferns, shrubs, trees, rocks, bare soil, water, logs/stumps, lichens, and bryophytes) as well as cover of individual species of grass, forbs, ferns, shrubs, and trees. The data are organized in two formats. The “Vegetation Cover by Quadrat” tab treats each combination of year and quadrat as a line of data and records cover data for all species within the quadrat in that year. The “Vegetation data by Species” tab treats each combination of year and species as a line of data and indicates everywhere a particular species was found in a given year.
Vegetation species presence/absence -
Species presence/absence data have been collected at Project Stream consistently each summer from 2014-2016. Data were collected along transects that run through the quadrats referred to above and used for vegetation cover data. Each transect is further divided into sections that lie between each set of quadrats. For each of these sections, the dataset includes presence/absence data for grass, forb, fern, shrub, and tree species. The data are organized in two formats. The “Vegetation Transect Data” tab treats each combination of year and transect as a line of data and records presence/absence data for all species found along the transect in that year. The “Vegetation data by Species” tab treats each combination of year and species as a line of data and indicates everywhere a particular species was found in a given year.
Tree data -
Tree data have been collected at Project Stream consistently each summer from 2015-2016. Along transects, individual tree data were recorded, including transect location, species, height class, DBH, and stem count. The data are located in the “Tree Data” tab of the file.Annual data 2014-201
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
A Literature Review of Unisexual Ambystoma and Related Polyploid Hybrid Survival and Development
No full textThe Ambystoma laterale-jeffersonianum complex is a collection of salamander populations inhabiting a significant portion of New England, including western Massachusetts. This complex consists of two groups, sexuals and unisexuals. Sexual A. laterale and A. jeffersonianum are diploid and reproduce sexually. Unisexuals, conversely, range from haploid to pentaploid, and are simply classified as Ambystoma, having no true species identity. This population of unisexual salamanders consists entirely of females which can reproduce both sexually and asexually (Bogart et al, 2007). Within this complex, unisexuals can sexually reproduce only with sexual males, often resulting in hybrid offspring (Charney et al., 2014). Due to the incongruence of ploidy between sexuals and unisexuals, hybrid offspring range in ploidy from haploid to pentaploid as well. While hybrids can develop into completely healthy, phenotypically normal adults, they face an extremely high mortality rate as embryos prior to the first cleavage event (Avis, 2019; Charney et al., 2019).
Throughout my research, I have amassed information regarding the Ambystoma complex’s embryogenesis, genetics, and environment in an attempt to consolidate much of what is currently known about them in the literature. In addition, I here propose multiple experiments that could be completed by future thesis students and other researchers in order to determine what factors play a role in causing this high mortality rate in early hybrid embryos.Biological Science
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