1,720,959 research outputs found
Calorimetric data of liquid Cu-Ti alloys
No full textTXT files with column headers Index Time (h) Furnace Temperature (°C) Sample Temperature (°C) HeatFlow (µV). Calisto software version 1.39 (Setaram Instrumentation - KEP Technologies, Caluire, France) was used to measure thermal effects. For binary Alloys from Cu-Ti in the composition range of xTi = 0.06-0.66. The calorimetric data for four separate experimental series, Tab_2_Series_A.txtTab_3_Series_B.txtTab_4_Series_C.txtTab_5_Series_D.txtThe measurements were conducted using the drop calorimetry method at temperatures of 1294 K and 1297 K for the liquid solutions. Four separate measurements were performed using two types of calibration materials and two types of crucible materials (MgO and ZrO2+Y2O3).The experimental study of liquid Cu-Ti alloys can be useful in the future for optimizing thermodynamic properties and phase diagram calculations. The results from drop calorimetric measurements at 1294 K and 1297 K for liquid Cu-Ti alloys show that the liquid solutions display negative deviations from ideal behavior. It was determined that the crucible materials used in the experiments (MgO and ZrO2+Y2O3) did not influence the measured changes in enthalpy of mixing at the tested temperatures.</p
Calorimetric data of the silver-titanium system
No full textDue to the experimental difficulties caused, among other factors, by the significant difference in melting points of the components, most of the information on the thermodynamic properties available in the literature has been obtained through computer methods. Therefore, the main goal of this work is to expand the current knowledge about the experimentally determined thermodynamic properties of selected alloys from the Ag-Ti system. Based on the calorimetric results obtained in this study, along with relevant thermodynamic data from the literature, the Ag-Ti phase diagram was reoptimized. The dataset provided includes the results of the experimental study presented in the article and a set of thermodynamic parameters obtained:1. The TXT files with column headers Index, Time (h), Furnace Temperature (°C), Sample Temperature (°C), and Heat Flow (µV) contain calorimetric data from two types of high-temperature drop calorimetry measurements.Files Tab_4_Seria_A_mixing_enthalpy.txt and Tab_5_Seria_B_mixing_enthalpy.txt include data on the enthalpy of mixing for liquid Ag–Ti alloys within the concentration range xTi = 0.02–0.226.Files Tab_6_No_1_formation_enthalpy.txt, Tab_6_No_2_formation_enthalpy.txt, Tab_6_No_3_formation_enthalpy.txt, and Tab_6_No_3A_formation_enthalpy.txt contain results for the enthalpy of formation of the AgTi intermetallic phase determined by the direct synthesis method.2. The Fig_2_DSC_measurement.txt file, with the headers Temp./C, Time/min, DSC/(mW/mg), Sensit./(uV/mW), contains the calorimetric data from the differential scanning calorimetry measurements for the Ag0.43Ti0.57 alloy after annealing.3. The Fig_3_XRD_after_direct_synthesis.xy file contains the XRD diffraction pattern of the alloy obtained during the first high-temperature direct synthesis calorimetry measurement.4. Files: Fig_1_a_SEM_Ag0.43Ti0.57.tiff; Fig_7_a_SEM_Ag.tiffFig_7_b_SEM_TiH2.tiff are SEM images of the materials used for the material preparation (Ag and TiH2) and the obtained alloy after annealing. 5. The Tab_8_thermodynamic_properties.odt file contains the thermodynamic parameters obtained and used for the phase diagram calculations.This work is supported by the National Science Centre, Poland, for funding project no. 2021/43/O/ST8/01291 entitled “Thermodynamic properties and structure of Cu-Mg-Ti and Ag-Mg-Ti alloys and their potential to interact with hydrogen” in the years 2022–2027. </p
Calorimetric data of liquid Ag-Mg-Ti alloys
No full textTXT files with column headers Index Time (h) Furnace Temperature (°C) Sample Temperature (°C) HeatFlow (µV). Calisto software version 1.39 (Setaram Instrumentation - KEP Technologies, Caluire, France) was used to measure thermal effects.The calorimetric data for five separate experimental series, with constant ratios of xAg/xMg = 9/1, 7/3, 1/1, and 3/7, and xAg/xTi = 19/1.Tab_2_Series_A.txt: 9/1 (xAg/xMg = 9/1);Tab_2_Series_A_prim.txt: 9/1 (xAg/xMg = 9/1);Tab_2_Series_B: 7/3 (xAg/xMg =7/3);Tab_2_Series_C: 1/1 (xAg/xMg =1/1);Tab_2_Series_D: 3/7 (xAg/xMg =3/7);Tab_3_Series_E: 19/1 (xAg/xTi = 19/1.).The measurements were performed using the drop calorimetry method at temperatures of 1294 K and 1297 K for the liquid solutions with the following constant mole fraction ratio: xAg/xMg = 9/1, 7/3, 1/1, 3/7 [(Ag0.9Mg0.1)1−xTix, (Ag0.7Mg0.3)1−xTix, (Ag0.5Mg0.5)1−xTix, (Ag0.3Mg0.7)1−xTix)], and xAg/xTi = 19/1 [(Ag0.95Ti0.05)1−xMgx].The experimental studies of liquid Ag-Mg-Ti alloys can be used in the future to optimize thermodynamic properties and phase diagram calculations. The results of drop calorimetric measurements at 1294 K and 1297 K for liquid Ag-Mg-Ti alloys indicate that the liquid solutions exhibit negative deviations from ideal behavior. The minimum integral molar enthalpy value was -13.444 kJ/mol for alloy Ag0.95Ti0.05 and xMg = 0.4182. </p
Calorimetric data of the copper-magnesium system
No full textTo enrich the existing knowledge of the thermodynamic properties of the Cu–Mg system, complementary experimental and theoretical investigations were conducted. A comprehensive set of thermodynamic data required for the determination of phase equilibria in the Cu–Mg system was obtained by combining both approaches. The experimental work included alloy preparation as well as structural and calorimetric analyses, while the theoretical part comprised ab initio and CALPHAD calculations. All methodologies and results are discussed in detail in this article.The provided data set contains the results of the experimental part of the article and a set of thermodynamic parameters:1. The *.txt files with column headers Index Time (h) Furnace Temperature (°C) Sample Temperature (°C) Heat Flow (µV) contain calorimetric data of the limiting partial enthalpy of solution of liquid Cu in tin and aluminum bath, and data of the formation enthalpy measurements in tin and aluminum bath. 2. Fig_2c_XRD_Cu2Mg.xy and Fig_3c_XRD_CuMg2.xy files are XRD diffraction patterns for alloys used for the enthalpy of formation measurements. 3. Fig_2a_BSE_Cu2Mg.tiff, Fig_3a_BSE_CuMg2.tiff, and Fig_4a_BSE_CuMg2_after_annealing.tiff files are SEM images of alloys used for the enthalpy of formation measurements. 4. The Tab_12_thermodynamic_parameters file contains the thermodynamic parameters obtained and used for the phase diagram calculations. This work is supported by the National Science Centre, Poland, for funding project no. 2021/43/O/ST8/01291 entitled “Thermodynamic properties and structure of Cu-Mg-Ti and Ag-Mg-Ti alloys and their potential to interact with hydrogen” in the years 2022–2027.</p
Calorimetric data of liquid Cu-Mg-Ti alloys
No full textSince limited information is available in the literature regarding the thermodynamic properties of the Cu-Mg-Ti system, this work aims to determine the mixing enthalpy change for several liquid alloys from this system. To achieve the intended purpose, the methods used were divided into two phases. The first covered the high-temperature calorimetric measurement of enthalpy of mixing performed at 1123 K – 1402 K for liquid solutions in six measurement series (A-F).The obtained calorimetric results for the integral molar mixing enthalpy change show a negative deviation from ideal solutions over the entire concentration measurement range. The presented results enhance the existing knowledge concerning thermodynamic properties of the Cu-Mg-Ti system.The provided data set contains the results of the experimental part of the article, included in Appendix A of the article:• .txt files with column headers Index Time (h) Furnace Temperature (°C) Sample Temperature (°C) Heat Flow (µV) contain calorimetric data of the mixing enthalpy change measurement for liquid Cu-Mg-Ti alloys.This work is supported by the National Science Centre, Poland, for funding project no. 2021/43/O/ST8/01291 entitled “Thermodynamic properties and structure of Cu-Mg-Ti and Ag-Mg-Ti alloys and their potential to interact with hydrogen” in the years 2022–2027. </p
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
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