Limiting phenomena in a new forming process for two-rib plates

This paper presents chosen results of theoretical and experimental research works on a new metal forming process of two-rib plates. The first part of the paper deals with forging technology of such products in a three-slide forging press, assuming two variants of the process: semi-open die forming and closed-die forming. In the further part of the paper, applying software simulations and making experiments for lead, the analysis of the assumed variants with consideration of optimal parameters of forming and present limiting phenomena was conducted. The phenomena disturbing the two-rib plates forging process were discussed in details. They include: plate buckling, overlapping and various types of forging deformation

Studying hydrogen bonding and dynamics of the acetylate groups of the Special Pair of Rhodobacter sphaeroides WT

Although the cofactors in the bacterial reaction centre of Rhodobacter sphaeroides wild type (WT) are arranged almost symmetrically in two branches, the light-induced electron transfer occurs selectively in one branch. As origin of this functional symmetry break, a hydrogen bond between the acetyl group of PL in the primary donor and His-L168 has been discussed. In this study, we investigate the existence and rigidity of this hydrogen bond with solid-state photo-CIDNP MAS NMR methods offering information on the local electronic structure due to highly sensitive and selective NMR experiments. On the time scale of the experiment, the hydrogen bond between PL and His-L168 appears to be stable and not to be affected by illumination confirming a structural asymmetry within the Special Pair

Studying hydrogen bonding and dynamics of the acetylate groups of the Special Pair of Rhodobacter sphaeroides WT

Although the cofactors in the bacterial reaction centre of Rhodobacter sphaeroides wild type (WT) are arranged almost symmetrically in two branches, the light-induced electron transfer occurs selectively in one branch. As origin of this functional symmetry break, a hydrogen bond between the acetyl group of PL in the primary donor and His-L168 has been discussed. In this study, we investigate the existence and rigidity of this hydrogen bond with solid-state photo-CIDNP MAS NMR methods offering information on the local electronic structure due to highly sensitive and selective NMR experiments. On the time scale of the experiment, the hydrogen bond between PL and His-L168 appears to be stable and not to be affected by illumination confirming a structural asymmetry within the Special Pair

Creating of innovative business model in modern enterprise

W artykule podjęto problem tworzenia modeli biznesowych w warunkach jakie stwarza współczesna rzeczywistość gospodarcza. Rozważania koncentrują się na mikroprocesach, w których wartość wyłania się dzięki interakcji agentów. Z tej perspektywy model biznesowy jawi się jako abstrakcyjne odwzorowanie złożonego doświadczenia. Dynamiczne ujęcie tych aspektów wyznacza potencjał innowacji w organizacji. Rozważania poparto wynikami badań własnych. We wnioskach sformułowano wskazówki metodologiczne do tworzenia modeli biznesu.In the article the problem of creating of business models in the conditions posed by contemporary economic reality is discussed. The author focus on the micro-processes of value, emerging in the interactions of agents. From this perspective, the business model appears as an abstract representation of the complex experience. The dynamic approach to these facets of the processes determines the potential of innovation within the organization. Methodological guidelines for creating business models are formulated in the conclusions

Strategic aspects of value creation to the client and enterprise

Artykuł dotyczy problemu tworzenia wartości dla klienta z punktu widzenia interesów strategicznych przedsiębiorstwa. Przyjęto, iż skuteczny wybór projektów i ich realizacja stanowią istotny mechanizm rozwoju modelu biznesowego, który pozwala na przetrwanie przedsiębiorstwa w dłuższej perspektywie w złożonym i dynamicznym otoczeniu. Podjęto próbę określenia podstaw do oceny inicjatyw strategicznych przedsiębiorstw, pod kątem tworzenia wartości odpowiadającej współczesnym uwarunkowaniom prowadzenia działalności gospodarczej. Zagadnienie zilustrowano odpowiednio dobranym przykładem praktycznym pochodzącym z branży górniczej.In this paper, author considers the problem of value creation to the client from the point of view of strategic interest of the enterprise. It was assumed, that suitable selection and implementation of strategic initiatives are relevant mechanisms of change in business models, which also makes it possible for enterprise to survive in dynamic and complex environment in long time perspective. The efforts have been made to pinpoint basics to evaluate initiative from the point of view of value creation in reference to contemporary business conditions. The concept was illustrated by case study from coal mine sector

Strategies of adjustment of business models of multinational companies to environment of emerging markets

W artykule przedstawiono strategie dostosowywania przedsiębiorstwa w warunkach ograniczeń instytucjonalnych właściwych dla rynków wyłaniających się. W zależności od sposobu uczenia się zidentyfikowano dwa typy strategii. W pierwszym, który jest właściwy dla tradycyjnych przedsiębiorstw międzynarodowych, zmianę traktuje się jako konieczny kompromis zagrażający efektywności na poziomie całego przedsiębiorstwa. W drugim ograniczenia instytucjonalne traktowane są jako kierunkowskazy do uczenia się. Twórcze podejście do ograniczeń instytucjonalnych może być podstawą skuteczności strategicznej przedsiębiorstw, które nie dysponują tradycyjnymi źródłami przewagi konkurencyjnej na rynku zagranicznym.The article presents strategies of adjustment of MNCs to institutional environment inherent in emerging markets. Two types of strategies were identified. First type is appropriate for the traditional MNCs, which perceive adjustment as a necessary compromise, threatening the efficiency of the company level. In the second case, institutional constraints are treated as indicators of learning. Creative approach to institutional constraints could become the basis for the strategic effectiveness of MNCs, which do not have the traditional sources of competitive advantage in a foreign market

Qualitative Research of AZ31 Magnesium Alloy Aircraft Brackets Produced by a New Forging Method

The paper reports a selection of numerical and experimental results of a new closed-die forging method for producing AZ31 magnesium alloy aircraft brackets with one rib. The numerical modelling of the new forming process was performed by the finite element method.The distributions of stresses, strains, temperature and forces were examined. The numerical results confirmed that the forgings produced by the new forming method are correct. For this reason, the new forming process was verified experimentally. The experimental results showed good agreement with the numerical results. The produced forgings of AZ31 magnesium alloy aircraft brackets with one rib were then subjected to qualitative tests

Qualitative Research of AZ31 Magnesium Alloy Aircraft Brackets Produced by a New Forging Method

The paper reports a selection of numerical and experimental results of a new closed-die forging method for producing AZ31 magnesium alloy aircraft brackets with one rib. The numerical modelling of the new forming process was performed by the finite element method.The distributions of stresses, strains, temperature and forces were examined. The numerical results confirmed that the forgings produced by the new forming method are correct. For this reason, the new forming process was verified experimentally. The experimental results showed good agreement with the numerical results. The produced forgings of AZ31 magnesium alloy aircraft brackets with one rib were then subjected to qualitative tests