Wyniki wyszukiwania dla: mec

• Quantitative structure activity relationships for the electron transfer reactions ofAnabaenaPCC 7119 ferredoxin-NADP+oxidoreductase with nitrobenzene and nitrobenzimidazolone derivatives: mechanistic implications

  Publikacja

  • Z. Anusevicius
  • A. Soffers
  • N. Cenas
  • J. Sarlauskas
  • M. Martinez-Julvez
  • I. Rietjens

  - FEBS Letters - Rok 1999

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• Practical Method for the Preparation of 2,2-Dimethyl-5- {aryl[(hetero)aryl]methyl}-1,3-dioxane-4,6-diones: Synthesis and Mechanistic Study

  Publikacja

  • E. Najda-Mocarska
  • A. Zakaszewska
  • K. Janikowska
  • S. Makowiec

  - SYNTHESIS-STUTTGART - Rok 2016

  An efficient practical synthetic procedure has been developed for the synthesis of 2,2-dimethyl-5-{aryl[(hetero)aryl]methyl}- 1,3-dioxane-4,6-diones through Friedel–Crafts alkylation. The scope and limitation of the reaction of 2,2-dimethyl-5-arylidene-1,3-dioxane- 4,6-diones with π-excess aromatic systems have been delineated.

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• Rola związków znaczonych izotopowo w analityce środowiskowej

  Publikacja

  • A. Mechlińska
  • L. Wolska
  • J. Namieśnik

  - Analityka: Nauka i Praktyka - Rok 2011

  Każdą procedurę analityczną można potraktować jako łańcuch złożony z ogniw, które obrazują poszczególne czynności i operacje. Zgodnie ze znanym przysłowiem, które mówi, że ''Łańcuch jest tak mocny jak jego najsłabsze ogniwo'', także i w przypadku procedur analitycznych szczególną uwagę należy zwrócić na te czynności i operacje (wykonywane zarówno w terenie, czyli in situ, jak i w laboratorium), które wymagają szczególnej troski...

• Removal of sulfur from a solvent extract

  Publikacja

  • A. Mechlińska
  • L. Wolska
  • J. Namieśnik

  - TRAC-TRENDS IN ANALYTICAL CHEMISTRY - Rok 2012

  The presence of sulfur in a solvent extract that is to be analyzed chromatographically impairs and sometimes precludes properinterpretation of the chromatogram, as the sulfur peak masks the peaks of other compounds present in the sample, and sulfur alsodisrupts the operation of the mass detector. This means that discrepancies in the results can lead to erroneous interpretations andfalse assessments of environmental risk. For this...

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• Green Analytical Chemistry Approaches in Sample Preparation

  Publikacja

  • M. Tobiszewski
  • A. Mechlińska
  • J. Namieśnik

  - Rok 2012

  This chapter presents environmentally friendly solutions for sample preparation. Attention is focused on extraction techniques and the minimization of organic solvent consumption, as the large quantitiesused in analytical laboratories are a pressing environmental problem. Solventless sample preparation techniques, alternative solvents, mediated extractions are discussed. The principle of each technique isbriefly described, together...

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• Rola związków znaczonych izotopowo w analityce środowiskowej

  Publikacja

  • A. Mechlińska
  • L. Wolska
  • J. Namieśnik

  - Analityka: Nauka i Praktyka - Rok 2010

  Etap pobierania próbki oraz przygotowania jej do analizy często stanowią najtrudniejsze zadanie analityczne, które może być przyczyną niekontrolowanych strat analitów, a zatem i wzrostu niepewności oznaczania zawartości analitu. Dlatego wymagane jest kontrolowanie strat analitów na wszystkich etapach przygotowania próbki do analizy. Nie jest to jednak proste zadanie. Powszechnie stosowane techniki ekstrakcji analitów z próbek środowiskowych...

• Comparison of different extraction techniques of polychlorinated biphenyls from sediments samples.

  Publikacja

  • A. Mechlińska
  • L. Wolska
  • J. Namieśnik

  - ANALYTICAL LETTERS - Rok 2010

  In this work, problems that may occur during determination of trace levels of polychlorinated biphenyls in sediment samples are described. Main error sources are connected with extraction of analytes prior to final determination. During model studies, polychlorinated biphenyls have been extracted from sedimentreference material (METRANAL 2) with the use of different solvents (dichloromethane, hexsane, and toluene); the process...

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• The effect of adding a standard on the result of determination of polychlorinated biphenyls in bottom sediment samples

  Publikacja

  • A. Mechlińska
  • L. Wolska
  • J. Namieśnik

  - TALANTA.The International Journal of Pure and Applied Analytical Chemistry - Rok 2010

  Bottom sediments are a very important component of aquatic ecosystems. The sediment matrix is highly diverse and heterogeneous; in consequence, compounds entering the aquatic environment from different sources are considerably enriched at its surface. Bottom sediments are regarded as natural sorbents, since they accumulate many harmful substances, such as heavy metals and stable organic contaminants.Extraction is a key stage in...

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• Isotope-labeled substances in analysis of persistent organicpollutants in environmental samples

  Publikacja

  • A. Mechlińska
  • L. Wolska
  • J. Namieśnik

  - TRAC-TRENDS IN ANALYTICAL CHEMISTRY - Rok 2010

  Ultratrace analysis of persistent organic pollutants (POPs) in environmental samples requires very sophisticated methods for both sample preparation and instrumental analysis. The complex matrix requires a multi-stage procedure. Each stage is a potential source of error, as a consequence of which the final result of analysis could be a source of misinformation rather than information. The individual stages and the procedure as...

• Green analytical chemistry : theory and practice

  Publikacja

  • M. Tobiszewski
  • A. Mechlińska
  • J. Namieśnik

  - CHEMICAL SOCIETY REVIEWS - Rok 2010

  This tutorial review summarises the current state of green analytical chemistry with special emphasis on environmentally friendly sample preparation techniques. Green analytical chemistry is a part of the sustainable development concept; its history and origins are described. Miniaturisation of analytical devices and shortening the time elapsing between performing analysis and obtaining reliable analytical results are important...

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• Tax support mechanisms for research and development projects in EU countries

  Dane Badawcze

  open access

  • P. Kasprzak

  One of the important areas requiring special support from the state are activities in pro-innovative investments. Tax incentives allocated to research and development are used by practically all European Union countries. Their aim is to persuade entities conducting business activity to invest in the so-called new technologies - defined as the area of...

• Influence of selected submicron inorganic particles on mechanical and thermo-mechanical properties of unsaturated polyester/glass composites

  Publikacja

  • J. Datta
  • M. Włoch

  - JOURNAL OF REINFORCED PLASTICS AND COMPOSITES - Rok 2014

  In this paper, the influence of different submicron-scaled particles (zinc oxide, titanium dioxide, or silica) on mechanical and thermo-mechanical properties of unsaturated polyester matrix composites reinforced with glass fabric was investigated. Surface morphology of obtained composites was also examined. At first inorganic particles were mechanically dispersed into unsaturated polyester resin system as per the calculated weight...

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• Advances in Applied Mechanics

  Czasopisma

  ISSN: 0065-2156

• Journal of Geometric Mechanics

  Czasopisma

  ISSN: 1941-4889 , eISSN: 1941-4897

• Coupled Systems Mechanics

  Czasopisma

  ISSN: 2234-2184 , eISSN: 2234-2192

• Computational Particle Mechanics

  Czasopisma

  ISSN: 2196-4378 , eISSN: 2196-4386

• INTERNATIONAL APPLIED MECHANICS

  Czasopisma

  ISSN: 1063-7095 , eISSN: 1573-8582

• Extreme Mechanics Letters

  Czasopisma

  ISSN: 2352-4316

• Journal of Solid Mechanics

  Czasopisma

  ISSN: 2008-3505

• Engineering Solid Mechanics

  Czasopisma

  ISSN: 2291-8752

• PNRPU Mechanics Bulletin

  Czasopisma

  ISSN: 2224-9893

• Theoretical and Applied Mechanics

  Czasopisma

  ISSN: 1450-5584

• Materials Physics and Mechanics

  Czasopisma

  ISSN: 1605-2730 , eISSN: 1605-8119

• Rock and Soil Mechanics

  Czasopisma

  ISSN: 1000-7598

• Applied and Computational Mechanics

  Czasopisma

  ISSN: 1802-680X

• International Journal of Mechanics

  Czasopisma

  ISSN: 1998-4448

• PROBABILISTIC ENGINEERING MECHANICS

  Czasopisma

  ISSN: 0266-8920 , eISSN: 1878-4275

• MECHANICS RESEARCH COMMUNICATIONS

  Czasopisma

  ISSN: 0093-6413

• MATHEMATICS AND MECHANICS OF SOLIDS

  Czasopisma

  ISSN: 1081-2865 , eISSN: 1741-3028

• Applied Mechanics Reviews

  Czasopisma

  ISSN: 0003-6900

• Computational Continuum Mechanics

  Czasopisma

  ISSN: 1999-6691

• Communications in Analysis and Mechanics

  Czasopisma

  eISSN: 2836-3310

• JOURNAL OF FLUID MECHANICS

  Czasopisma

  ISSN: 0022-1120 , eISSN: 1469-7645

• MECHANICS OF COMPOSITE MATERIALS

  Czasopisma

  ISSN: 0191-5665 , eISSN: 1573-8922

• Applied Mathematics and Mechanics

  Czasopisma

  ISSN: 1000-0887

• STRUCTURAL ENGINEERING AND MECHANICS

  Czasopisma

  ISSN: 1225-4568 , eISSN: 1598-6217

• ARCHIVE OF APPLIED MECHANICS

  Czasopisma

  ISSN: 0939-1533 , eISSN: 1432-0681

• Mechanizmy wsparcia rozwoju wysokosprawnej kogeneracji i OZE oraz wykorzystania energii odpadowej w Polsce i UE

  Publikacja

  • J. Buriak

  - Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej - Rok 2011

  Przedstawiono zobowiązania i główne wnioski zawarte w dyrektywach Komisji Europejskiej oraz w krajowych ustawach i rozporządzeniach ministerialnych, dotyczących wdrożenia mechanizmu wsparcia źródeł rozproszonego wytwarzania energii. Skupiono się głównie na wsparciu dla rozwoju wysokosprawnej kogeneracji. Zaprezentowano szanse wynikające dla małych i średnich przedsiębiorstw, działających w branży instalatorskiej i energetycznej,...

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• A Mesh Deformation Technique Based on Solid Mechanics for Parametric Analysis of High-Frequency Devices With 3-D FEM

  Publikacja

  • A. Lamęcki

  - IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES - Rok 2016

  In this paper, a versatile technique for mesh defor- mation is discussed, targeted at the electromagnetic (EM) field simulation of high-frequency devices using the 3-D finite element method (FEM). The approach proposed applies a linear elasticity model to compute the displacements of the internal mesh nodes in 3-D when the structure geometry is changed. The technique is compared with an alternative approach...

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• A new hyperbolic-polynomial higher-order elasticity theory for mechanics of thick FGM beams with imperfection in the material composition

  Publikacja

  • M. Malikan
  • V. Eremeev

  - COMPOSITE STRUCTURES - Rok 2020

  A drawback to the material composition of thick functionally graded materials (FGM) beams is checked out in this research in conjunction with a novel hyperbolic‐polynomial higher‐order elasticity beam theory (HPET). The proposed beam model consists of a novel shape function for the distribution of shear stress deformation in the transverse coordinate. The beam theory also incorporates the stretching effect to present an indirect...

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• Thermal Buckling Analysis of Circular Bilayer Graphene sheets Resting on an Elastic Matrix Based on Nonlocal Continuum Mechanics

  Publikacja

  • M. Ahmad Pour
  • M. E. Golmakani
  • M. Malikan

  - Journal of Applied and Computational Mechanics - Rok 2021

  In this article, the thermal buckling behavior of orthotropic circular bilayer graphene sheets embedded in the Winkler–Pasternak elastic medium is scrutinized. Using the nonlocal elasticity theory, the bilayer graphene sheets are modeled as a nonlocal double–layered plate that contains small scale effects and van der Waals (vdW) interaction forces. The vdW interaction forces between the layers are simulated as a set of linear springs...

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• Mechanical metamaterials manufactured by increasing technology

  Publikacja

  • R. Knitter
  • T. Królikowski

  - Mechanik - Rok 2018

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• The analysis of mechanical vibrations with use of the MATHCAD.

  Publikacja

  • T. Kucharski

  - Rok 2004

  Przedstawiono zagadnienie analizy drgań mechanicznych ze wspomaganiem komputerowym za pomocą programu MATHCAD. Omówiono zagadnienia zastosowania programu w edukacji i w obliczeniach inżynierskich.

• Mechanical strength of stems in aquatic macrophytes

  Publikacja

  • K. Bociąg
  • A. Gałka
  • T. Łazarewicz
  • J. Szmeja

  - ACTA SOCIETATIS BOTANICORUM POLONIAE - Rok 2009

  Summary: In populations of submerged macrophytes, individuals are selected in terms of resistance to the effect of hydrodynamic forces. The aim of this study was to check whether individuals growing in river water are more tensile and bending resistant than plants occurring in places not exposed to flow stress. We determined the ultimate tensile strength of stems in four macrophyte species, Potamogeton natans, P. pectinatus, Batrachium...

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• Mechanical Properties of Human Abdominal Fascia

  Publikacja

  • A. Tomaszewska

  - Rok 2012

  W pracy przedstawiono wyniki identyfikacji modułu sprężystosci i współczynnika Poissona próbek powięzi ściany brzucha człowieka, którą przeprowadzono na podstawie testów jednoosiowego rozciągania.

• Mechanical Properties of Aluminium Bracket Strengthening

  Publikacja

  • A. Ambroziak

  - Archives of Civil Engineering - Rok 2019

  The aim of the research is laboratory investigation of aluminium brackets employed to fasten lightweight curtain walls to building facilities. Tensile loads perpendicular to end plates (vertical) were applied here. The author focused on the solutions intended to increase the load-carrying capacity of aluminium brackets applying the plain washer form A (DIN 125; ISO 7089), plain washer with an outer diameter about 3d (DIN 9021;...

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• Mechanical testing of technical woven fabrics

  Publikacja

  • A. Ambroziak
  • P. Kłosowski

  - JOURNAL OF REINFORCED PLASTICS AND COMPOSITES - Rok 2013

  This article presents a review of technical fabrics testing methods used by the authors on the basis of their experience with research on properties of polytetrefluoroethylene-coated fabrics used for Forest Opera in Sopot (Poland). First, the different types of testing methods used for description of mechanical properties (uniaxial tensile tests, biaxial tensile tests and shear tests) of technical woven fabrics are described. The...

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• Mechanical Properties of Human Stomach Tissue

  Publikacja

  • S. Grymek

  - Rok 2022

  The dataset entitled Determination of mechanical properties of human stomach tissues subjected to uniaxial stretching contains: the length of the sample as a function of the corresponding load (tensile force) and the initial values of the average width and average thickness of the sample. All tests were conducted in a self-developed tensile test machine: PG TissueTester. The dataset allows the coefficients of various models of...

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• Application and mechanical properties of aluminium alloys

  Publikacja

  • A. Ambroziak
  • M. T. Solarczyk

  - Rok 2018

  The paper presents a short survey of the application and mechanical properties of aluminium alloys. This area of scientific research is still developing, the authors restricted it to about 30 papers. Numerical simulations of the aluminium bracket are also investigated. The authors propose a solution to increase the load capacity of aluminium brackets with application of the additional cover plates. This study is proposed as an...

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• MUTATION RESEARCH-FUNDAMENTAL AND MOLECULAR MECHANISMS OF MUTAGENESIS

  Czasopisma

  ISSN: 0027-5107 , eISSN: 1873-135X