98 research outputs found
Oroszország megteszi a magáét, hogy az elektronikus forrásokat Bonntól egészen Vlagyivosztokig el lehessen érni
No full textZEMSKOV, A. I.: Dostup k elektronnym resursam ot Bonna do Vladivostoka. = Naucnye i tehniceskie biblioteki, 7. sz. 2000. p. 25-37
Four Winds on the Grey Landscape : A Review of Four Information Professionals, Their Work and Impact on the Field of Grey Literature
No full textThe First International Conference on Grey Literature in 1993 was entitled "Weinberg Report 2000" in honor of Alvin M. Weinberg. In the early 60's, Weinberg chaired President Kennedy's Science Advisory Committee and produced the famous report "Science, Government, and Information: the Responsibility of the Technical Community and the Government in the Transfer of Information". Along these lines, a special tribute will be paid at this Fifth International Conference on Grey Literature to four information professionals, who have had long careers in information, who themselves attended and presented papers at the First International Conference on Grey Literature, and who have made lasting contributions to specific areas in the field of grey literature. The four are Vilma Alberani, Italy; Peter Auger, United Kingdom; Ulrich Wattenberg, Germany; and Andrei Zemskov, Russia. Early this summer, each of the four was contacted via GreyNet's office and was asked to provide bibliographic, autobiographic and other human-interest reference material in an effort to gather firsthand information for the paper and its subsequent presentation. GreyNet also used its website to request from other colleagues secondary information that would contribute in the process of writing this review article. Where historical, biographical, and documentary facts leave off; the author exerts his own prerogative drawing comparisons, forming analyses, and seeking a celebrated closure.Includes: Conference preprint, Powerpoint presentation, Abstract and Biographical notes, Pratt student commentaryXAInternationa
Interactive mathematical model of self-healing in carbonated cementitious materials
No full textA mathematical model for the post-damage recovery of carbonated cement is described. The model is based on a two-dimensional initial-boundary value problem for a system of partial differential equations. The study is embedded within the framework of investigating the effect of using lightweight expanded clay aggregate, which is incorporated into the impregnation of the sodium monofluorophosphate (Na-MFP) solution. The model of the self-healing process is built under the assumption that the position of the carbonation front changes in time. Here the rate of diffusion of Na-MFP into the carbonated cement matrix and the reaction rates of the free phosphate and fluorophosphate with the components of the cement are comparable to the speed of the carbonation front. The main modeling results presented in the paper are related to the autonomous improvement of the structure of carbonated blast furnace slag cement. Nevertheless, the parameters of the model can be set for various types of cement paste and different conditions of the healing process (including both carbonation under natural conditions and accelerated carbonation). The governing diffusion-reaction equations are solved using a Galerkin finite-element method. For usage convenience, the model is completed as an interactive application on the basis of computer algebra system Mathematica.Delft Institute of Applied MathematicsElectrical Engineering, Mathematics and Computer Scienc
A mathematical model for baterial self-healing of cracks in concrete (abstract)
No full textStructural EngineeringCivil Engineering and Geoscience
Stability analysis of fronts in a tristable reaction-diffusion system
No full textA stability analysis is performed analytically for the tristable reaction-diffusion equation, in which a quintic reaction term is approximated by a piecewise linear function. We obtain growth rate equations for two basic types of propagating fronts, monotonous and nonmonotonous ones. Their solutions show that the monotonous front is stable whereas the nonmonotonous one is unstable. It is found that there are two values of the growth rate for the most dangerous modes (corresponding to the longest possible wavelengths), and , for the monotonous front, so that at the perturbation eigenfunction is positive whereas when it changes sign. It is also noted that the eigenvalue becomes negative in an inhomogeneous system with a particular (stabilizing) inhomogeneity. Counting arguments for the number of eigenmodes of the linear stability operator are presented. Copyright Springer-Verlag Berlin/Heidelberg 2004
Molecular detection of metastases in regional lymph nodes in patients with cancer of the head of the pancreas. Clinical relevance
No full textThe purpose of this work was:
1. To test the efficacy of two molecular methods: Restriction Fragment Length Polymorphism Polymerase Chain Reaction (RFLP PCR) for detection of mutation in codon 12 of oncosuppressor K-ras gene and Reverse Transcription (RT) PCR for Cytokeratine20 (CK20) expression as markers for molecular detection of occult metastases (MDM) in patients with adenocarcinoma of the pancreas.
2. To analyze factors of influence and pattern of MDM appearance in distant lymph nodes in patients after extended pancreatoduodenal resection (R0 patients).
3. To analyze the influence of distant nodal MDM on clinical prognosis.
Methods: The study was carried out on 28 patients. Altogether there were 531 lymph nodes histologically investigated in this study. Of these 305 lymph nodes were distant regional lymph nodes hemisected and tested for the K-ras and CK20 markers.
Results:
1. Histological examination showed tumor invasion in 11,0 % distant lymph nodes. Application of molecular methods (K-ras and CK20 together) increased this index up to 25,9 %. The method of combined K-ras and CK20 detection has sensitivity 96,7 %.
2. The distant nodal MDM in patients with pancreatic cancer is a phenomenon independent from the morphological parameters of primary tumor and pN status. The most frequent site of MDM appearance in regional lymphatic system was the para-aortal lymph nodal station.
3. Among patients with MDM who were diagnosed on the basis of a concurrence of both positive K-ras and CK20 markers in the same lymph node (concordant markers), there were 4 patients with MDM in para-aortic lymph nodes (LN16). In this group there were no 2-year survivors observed and the median survival and median PFS were both equal to 13 (range, 1-18) months. This group of patients was compared to the group of 10 patients with no signs of MDM in para-aortic lymph nodes and the difference in the survival rate was considerable. The 2-year actual survival and 2-year progression free survival (PFS) in the latter group respectively was 50 % and 60 % while median survival and median PFS, respectively, were 32 (range, 1-40) and 26 ( range, 1-37) months.
The data concerning clinical relevance of MDM was obtained from 14 patients. The question of MDM influence on clinical prognosis requires further investigation in larger populations of patients
U.S. strategy in Central Asia
No full textThe article considers the questions connected with the strategy of the U.S. in Central Asia, which has long-term character. In this connection, the author notes that successive governments of the USA, the American political and expert community, business circles traditionally in the last twenty years pay particular attention to this region, bringing to secure the U.S. presence in the region the concept of "Big Central Asia"
Ljudskie poteri SSSR v 1941-1945 gg. (k voprosu o stepeni dostovernosti imejuščichsja podsčetov)
No full text36-я Конференция ИАТУЛ. Обзор работы
No full textThe author reviews the Conference main topics: open access as a part of open science concept and its impact on library technologies; modern methods of data processing; working with non-text materials (video, images, research data, etc.); innovative hardware (mobile devices, 3D-printers, etc.) and social networks in libraries as user engagement tools); new approaches towards library space design and furnishing. The author also focuses on the keynote papers presented at the Conference.В обзоре представлены основные темы конференции: открытый доступ как часть концепции открытой науки и его воздействие на библиотечные технологии; использование современных методик обработки данных; работа с нетекстовыми материалами (видео, рисунки, научные данные и т.д.); инновационное оборудование (мобильные устройства, 3D-принтеры и др.) и технологии социальных сетей в библиотеках как средства привлечения пользователей; новые подходы к компоновке и оформлению библиотечных помещений. Особое внимание уделено рассмотрению ключевых лекций
Modeling of a self-healing process in blast furnace slag cement exposed to accelerated carbonation
No full textIn the current research, a mathematical model for the post-damage improvement of the carbonated blast furnace slag cement (BFSC) exposed to accelerated carbonation is constructed. The study is embedded within the framework of investigating the effect of using lightweight expanded clay aggregate, which is incorporated into the impregnation of the sodium mono-fluorophosphate (Na-MFP) solution. The model of the self-healing process is built under the assumption that the position of the carbonation front changes in time where the rate of diffusion of Na-MFP into the carbonated cement matrix and the reaction rates of the free phosphate and fluorophosphate with the components of the cement are comparable to the speed of the carbonation front under accelerated carbonation conditions. The model is based on an initial-boundary value problem for a system of partial differential equations which is solved using a Galerkin finite element method. The results obtained are discussed and generalized to a three-dimensional case.Delft Institute of Applied MathematicsElectrical Engineering, Mathematics and Computer Scienc
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