Acorn: A grid computing system for constraint based modeling and visualization of the genome scale metabolic reaction networks via a web interface

Constraint-based approaches facilitate the prediction of cellular metabolic capabilities, based, in turn on predictions of the repertoire of enzymes encoded in the genome. Recently, genome annotations have been used to reconstruct genome scale metabolic reaction networks for numerous species, including Homo sapiens, which allow simulations that provide valuable insights into topics, including predictions of gene essentiality of pathogens, interpretation of genetic polymorphism in metabolic disease syndromes and suggestions for novel approaches to microbial metabolic engineering. These constraint-based simulations are being integrated with the functional genomics portals, an activity that requires efficient implementation of the constraint-based simulations in the web-based environment

Session 17 Ecophysiology

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Formuły nośności wyboczeniowej elementów konstrukcji szklanych

Development of contemporary building industry and related search for new aesthetical and functional solutions of monumental buildings in the centers of large cities resulted in the interest in glass as a structural material. Attractiveness of glass as a building material may be derived from the fact, that it combines transparency and aesthetical look with other functional features. Application of glass results in modern look of building facades, improves the indoor comfort without limiting the availability of natural daylight. Wide implementation of the new high performance float flat glass manufacturing technology, in conjunction with increasing expectations of the construction industry relating to new glass functions, has led to significant developments in glass structures theory, cf. [1, 3, 4, 5, 9, 10]. Many years of scientific research conducted in European Union countries have been crowned with a report CEN/TC 250 N 1050 [2], compiled as a part of the work of European Committee for Standardization on the second edition of Eurocodes - an extension of the first edition by, among others, the recommendations for the above mentioned design of glass structures, in particular modern procedures for the design of glass building structures. The procedures proposed in the pre-code [2] are not widely known in Poland, and their implementation in the design codes should be verified at the country level. This task is undertaken in this paper.Rozwój nowoczesnego budownictwa i związane z tym poszukiwanie nowych rozwiązań w zakresie estetyki i funkcjonalności budynków reprezentacyjnych w centrach dużych miast, stało się przyczyną zainteresowania szkłem. Atrakcyjność szkła jako materiału budowlanego wynika z faktu, że łączy ono w sobie przeźroczystość i estetyczny wygląd z innymi cechami użytkowymi. Jego zastosowanie nadaje nowoczesny wygląd elewacjom budynków i polepsza komfort przebywania w pomieszczeniach, nie ograniczając przy tym naturalnego oświetlenia dziennego, Wdrożenie nowej, wysokowydajnej technologii produkcji szkła płaskiego float, w powiązaniu z rosnącymi wymaganiami budownictwa, dotyczącymi nowych funkcji szkła, doprowadziło do znacznego rozwoju teorii konstrukcji szklanych, por. prace [1, 3, 4, 5, 9, 10]. Wieloletnie badania naukowe prowadzone w krajach Unii Europejskiej zostały zwieńczone opracowanym dokumentem CEN/TC 250 N 1050 [2], zredagowanym w ramach prac Europejskiego Komitetu Normalizacyjnego nad drugą edycją Eurokodów. W wydaniu tym zaproponowano poszerzenie pierwszej edycji między innymi o rekomendacje w/z projektowania konstrukcji szklanych, a w szczególności o nowoczesne procedury w zakresie obliczania konstrukcji budowlanych szklanych. W Polsce zaproponowane w prenormie [2] procedury nie są powszechnie znane, a ich implementacja do norm projektowania wymaga przeprowadzenia weryfikacji krajowej, co podejmuje niniejsza praca

A wide-band power electronics current source in reference current generator

The paper considers wide-band voltage controlled power electronics current source. The current source has been designed as a part of 1-channel reference current generator designed for current meters testing. The control module of the generator utilizes a specialized Analog Devices Inc. DSPs based microcomputer module for power electronics applications. Used solutions have allowed obtain high quality referencing of the output current within reference signal. The paper presents the structure and selected aspects of the control algorithm of the current source. Also selected investigations results of the laboratory prototype of generator are presented

Sub-phase power electronics inverters

Dynamic changes of parameters of energy sources and receivers are reasons that decrease exactitude of output signals towards reference signals. To improve these parameters more advanced solutions of power electronics systems are necessary. Ones of possible solutions are a sub-phase inverters. The output quantity regulator there is based on Generalized Sampling Expansion, being crucial extension of Whittaker-Kotelnikov-Shannon sampling theorem. Wide-band power electronics current source with regulator based on that extension is analyzed further

Broadband power electronics controlled current source with analogue control section and output stage based on GaN transistors

The paper presents the conception of the power electronics controlled current source based on the sigma–delta modulator (SDM). Due to very high frequency of the SDM output bit stream, in the power stage of inverter the gallium-nitride (GaN) transistors are used. In these circumstances even efficient DSPs are unable, due to limitation of its pass–band of the control path, to obtain right parameters of the output current regulator. So, the regulator is done in the fully analogue manner. As result of these the value of distortions of the inverter output current is much lower, compared to the typical, PWM based, solutions. This benefit is not paid significantly by increase in the system complexity. In work the converter operation basics and results of its simulation model studies are presented

Interpolation Formulas for Coefficients Reducing the Strength of Steel and Aluminum Alloys in Increasing Temperatures

Heating of steel or structural aluminum alloys at a speed of 2 to 50 K/min - characterizing the fire conditions - leads to a reduction in mechanical properties of the analyzed alloys. The limit of proportionality fp, real fy and proof f02 yield limit, breaking strength fu and longitudinal limit of elasticity E decrease as the temperature increases. Quantitative evaluation of the thermal conversion in strengths of structural alloys is published in Eurocodes 3 and 9, in the form of dimensionless graphs depicting reduction coefficients and selected (tabulated) discrete values of mechanical properties. The author’s proposal for an analytical formulation of code curves describing thermal reduction of elasticity modulus and strengths of structural alloys recommended for an application in building structures is presented in this paper

The geotechnical parameters of the subsoil in view of purpose of plot of land in the Land Development Plan

Tematyka poruszana w niniejszym artykule dotyczy kwestii związanych z sposobem określania przeznaczenia w miejscowych planach zagospodarowania przestrzennego nieruchomości gruntowych pod różnego rodzaju zabudowę, które niejednokrotnie jest przypisywane bez przeprowadzenia jakiejkolwiek racjonalnej analizy. Wskazana została tutaj konieczności oznaczania na mapach miejscowych planów zagospodarowania przestrzennego terenów o podwyższonym ryzyku wystąpienia zagrożeń naturalnych w postaci powodzi, potopień, osuwisk, trzęsień ziemi, tąpnięć itp. Przedstawiono argumenty potwierdzające konieczność przeprowadzania odpowiedniego rozpoznania geotechnicznego podłoża przeznaczonego pod zabudowę komercyjna komunikacyjną czy mieszkaniową wraz ze wskazaniem celowości podjęcia takich kroków oraz sposobu wykorzystania pozyskanych danych o kondycji podłoża gruntowego między innymi podczas szacowania wartości rynkowej nieruchomości, procesu projektowania rozwiązania konstrukcyjnego i architektonicznych najlepiej ograniczającego wpływ potencjalnych oddziaływań na konstrukcję, a także wskazano możliwość wykorzystania wyników badań do stworzenia bazy danych dla określonego obszaru.In that paper we try to show all important aspect of soil condition and natural hazards that will be helpful to designed appropriate load-bearing capacity of subsoil that are used in The Land Development Plan in commercial way. That information help estimate the cost that should be spend by investor before starting to built the construction over that ground and in that area. The purpose for plots of land in the land development plan should take into consideration soil structure and geotechnical condition, dynamic environment influenced by both internally and externally imposed forces, types of stresses and strains to which the soil is subjected. There are important natural factors that have big influence on type of buildings foundation and all architecting construction. Geotechnical experts should assist in the development processes that will result in economic solutions. Planning and building authorities should require geotechnical hazard reports as part of submissions for approval of subdivisions or development plans; and such reports should include evaluations of the hazards to various structures and recommendations on the most suitable design and construction practices to ensure economic long-term performance. All of this information give estimators possibility to calculate market value of plot use the residual method which base of land market value and take into consideration the cost of reinforced the weak land by comparison with market value of land in good geotechnical condition

The power electronics controlled current source utilized in the reference current generator

The paper considers wide-band voltage controlled power electronics current source. The current source has been designed as a part of 1-channel reference current generator designed for current meters testing. The control module of the generator utilizes specialized Analog Devices Inc. DSPs based microcomputer module for power electronics applications. Used solutions have allowed obtain high quality referencing of the output current within reference signal. The paper presents the structure and selected aspects of the control algorithm of the current source. Also selected investigations results of laboratory prototype of generator with utilization of controlled current source are presented

Power electronics controlled current source based on a multi-converter topology

The paper presents the idea of power electronics voltage controlled current source (VCCS) which is able much more precise mapping of its output current in a reference signal, compared to a typical converter solution. It can be achieved by means of such interconnection of two separate converters that one of them corrects a total output current towards a reference signal. An output power of auxiliary converter is much lower than an output power of main one but its frequency response is extended. Thanks to continuous work of this converter also pulse modulation components in a total output current are minimized. In the paper an exemplary application of a current source, as an execution block of active power filter (APF), is presented