1,721,030 research outputs found
Clinical outcome and time trends of surgically treated renal cell carcinoma between 1986 and 2010: results from a single centre in Sweden
No full textThe aims of this study were to create a cohort of retrospectively collected renal cell carcinoma (RCC) specimens to be used a basis for prognostic molecular studies, and to investigate the outcome and time trends in patients surgically treated for RCC in a single-centre cohort
The impact of temperature on furan resin and binders structure
No full textTyt. z nagłówka.Bibliogr. s. 79-[80].Pod wpływem działania wysokiej temperatury zachodzi wiele zmian strukturalnych w spoiwach stosowanych do sporządzania mas formierskich i rdzeniowych. Zmiany te mogą polegać na tworzeniu nowych wiązań, zmianie ich charakteru lub też przebudowie struktury, czemu może towarzyszyć na przykład destrukcja (zanik) niektórych wiązań chemicznych. Mają one istotny wpływ na właściwości mechaniczne i technologiczne mas, ale także na szkodliwość mas dla środowiska czy zdolność masy do regeneracji. W artykule przedstawiono wyniki badań strukturalnych w podczerwieni dwóch żywic furanowych oraz dwóch spoiw sporządzonych na bazie tych żywic. Zarówno czyste żywice, jak i sporządzone na ich bazie spoiwa, poddano działaniu temperatury. Określono zmiany zachodzące w ich strukturze w zakresie temperatury 25-200 °C z zastosowaniem spektroskopii w podczerwieni.Exposure to high temperature causes a series of structural changes in binders used to prepare moulding and core sands. These changes may consist in the formation of new bonds, changes to their character or a transformation of the structure which may be accompanied, for example, by the destruction (disappearance) of some chemical bonds. They have a significant impact on the mechanical and technological properties of sands, but also on their environmental noxiousness or the ability to reclaim the sand. This article presents the results of infrared structural examinations of two furan resins and two binders produced based on those resins. Both pure resins and binders made of them were exposed to temperature. Changes taking place in their structure in the 25-200 °C temperature range were determined using infrared spectroscopy.Dostępny również w formie drukowanej.SŁOWA KLUCZOWE: żywice furanowe, spoiwa furanowe, FTIR, ATR. KEYWORDS: furan resins, furan binders, FTIR, ATR
Biodegradation of a new polymer binder based on modified starch in a water environment Biodegradacja nowego spoiwa polimerowego na bazie skrobi modyfikowanej w środowisku wodnym /
No full textTyt. z nagłówka.Bibliogr. s. [14].In this study, the results of biodegradability of a new polymeric binder consisting of modified starch – Polvitex Z (by Xenon) in a water solution are presented. Biodegradation tests were conducted in accordance with the Zahn–Wellens method, which is intended to denote the susceptibility to biodegradation by microorganisms (in high concentrations during the static test) of the non-volatile, watersoluble organic compounds. Observations of the decomposition process were carried out through regular, daily or at certain time intervals by measurement the Chemical Oxygen Demand (COD) and level of biodegradability (RT) in the prepared samples during the test. The study showed that the starch binder is fully biodegradable material in an aqueous medium.W niniejszej pracy zostały omówione wyniki badań stopnia biodegradacji roztworu wodnego modyfikatu skrobiowego Polvitex Z firmy Xenon – materiału polimerowego użytego jako spoiwo do mas formierskich. Testy biodegradacji przeprowadzono zgodnie z metodą Zahna–Wellensa, która ma na celu oznaczenie podatności nielotnych, rozpuszczalnych w wodzie związków organicznych na biodegradacje przez mikroorganizmy występujące w dużym stężeniu podczas badania statycznego. Obserwacje procesu rozkładu prowadzono przez regularne, codzienne lub w określonych przedziałach czasowych pomiary chemicznego zapotrzebowania na tlen (ChZT) i stopnia biodegradacji (R T), mierzonych w przygotowanych próbkach w trakcie trwania testu. Przeprowadzone badania wykazały, że spoiwo skrobiowe jest materiałem w pełni biodegradowalnym w środowisku wodnym.Dostępny również w formie drukowanej.SŁOWA KLUCZOWE: biopolimery, spoiwa polimerowe, masy formierskie, biodegradacja. KEYWORDS: biopolymers, polymer binders, moulding sands, biodegradation
STEREOTYPES IN MANAGEMENT OF EMPLOYEES 50+
Full text linkThe article presents the definition of a stereotype and discusses the mechanisms of its impact. As part of the study, the author identifies selected stereotypes in the workplace, focusing on employees aged 50+, and then describes them. The basis for the deliberations is a review of scientific literature, with particular emphasis on the results of several international empirical studies. The aim of the article is to discuss selected stereotypes, both positive and negative, regarding employees aged 50+. Based on the interpretation of stereotypical views, guidelines for managers were formulated.The article presents the definition of a stereotype and discusses the mechanisms of its impact. As part of the study, the author identifies selected stereotypes in the workplace, focusing on employees aged 50+, and then describes them. The basis for the deliberations is a review of scientific literature, with particular emphasis on the results of several international empirical studies. The aim of the article is to discuss selected stereotypes, both positive and negative, regarding employees aged 50+. Based on the interpretation of stereotypical views, guidelines for managers were formulated
STEREOTYPES IN MANAGING DIVERSITY IN THE CONTEXT OF SEX
Full text linkThe article presents the definition of gender stereotype and discusses the mechanisms of its impact. The focus has been on gender, due to the need to promote equal opportunities for women and men and to empower women in the labor market. As part of the study, the author identifies selected stereotypes, both positive and negative, functioning in diversity management, focusing on gender, and then interprets them. The basis for the deliberations is a review of scientific literature, with particular emphasis on the results of several international empirical studies. Based on the interpretation of stereotypical views, guidelines for managers managing diversity were formulated.The article presents the definition of gender stereotype and discusses the mechanisms of its impact. The focus has been on gender, due to the need to promote equal opportunities for women and men and to empower women in the labor market. As part of the study, the author identifies selected stereotypes, both positive and negative, functioning in diversity management, focusing on gender, and then interprets them. The basis for the deliberations is a review of scientific literature, with particular emphasis on the results of several international empirical studies. Based on the interpretation of stereotypical views, guidelines for managers managing diversity were formulated
BTEX emissions from BioCo2 bonded moulding sands Emisja związków zaliczanych do grupy BTEX z masy wiązanej spoiwem BioCo2 /
No full textTyt. z nagłówka.Bibliogr. s. 30-[31].Przedstawione badania emisji gazów miały na celu określenie poziomu wydzielania związków chemicznych: benzenu, toluenu, etylobenzenu i ksylenów (BTEX) z masy wiązanej nowym spoiwem polimerowym BioCo2. Spoiwo stanowiło roztwór wodny dwuskładnikowej kompozycji polimerowej poli(kwas akrylowy)/dekstryna. Przeprowadzone pomiary emisji gazów wykonano według metody opracowanej na Wydziale Odlewnictwa AGH. Metoda pomiarów emisji umożliwiała pobranie próbek zaadsorbowanych gazów BTEX na węglu aktywnym w celu ich analizy jakościowej i ilościowej przy zastosowaniu techniki chromatografii gazowej (GC-FID). Na podstawie przeprowadzonych badań stwierdzono, że poziom emisji BTEX badanej masy podczas procesu zalewania ciekłym metalem był niski w porównaniu z poziomem emisji mas wiązanych żywicą Kaltharz U404.The aim of the research was to determine the volume of BTEX emission (benzene, toluene, ethylbenzene and xylenes) from BioCo2 bonded moulding sands. BioCo2, a new polymer binder, is a water solution of two - component polymer composition (polyacrylic acid and dextrin). Research on gas emissions were performed according to the method developed at Faculty of Foundry Engineering, AGH University of Science and Technology. The measurement of BTEX samples adsorbed on activated carbon was made with the use of gas chromatography (GC-FID) and was followed by a qualitative and quantitative analysis. The research showed that the volume of BTEX emissions was lower in BioCo2 bonded moulding sand than in resin-bonded sand Kaltharz U404.Dostępny również w formie drukowanej.SŁOWA KLUCZOWE: masa formierska, spoiwo polimerowe, emisja gazów, chromatografia gazowa. KEYWORDS: moulding sands, polymer binders, gas emissions, gas chromatography
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
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