Observation of a 331 K (58 °C) spin transition for bis[hydrotris(1,2,4-triazol-1-yl)borate]iron(II) by variable temperature infrared spectroscopy and magnetic susceptibility measurements

Fe{HB(CHN)} is observed by variable temperature infrared and magnetic studies to have a spin transition between the low spin S = 0 and high spin S = 2 states at 331 K (58 °C) with thermal hysteresis of ~1.5 K. Changes in the triazole ligand IR absorptions demonstrate that distant non-metal-ligand vibrations are altered upon the change in electronic structure associated with the spin-crossover can be used to monitor the the spin-crossover transition.

The Riesz transform and simultaneous representations of phase, energy and orientation in spatial vision

To represent the local orientation and energy of a 1-D image signal, many models of early visual processing employ bandpass quadrature filters, formed by combining the original signal with its Hilbert transform. However, representations capable of estimating an image signal's 2-D phase have been largely ignored. Here, we consider 2-D phase representations using a method based upon the Riesz transform. For spatial images there exist two Riesz transformed signals and one original signal from which orientation, phase and energy may be represented as a vector in 3-D signal space. We show that these image properties may be represented by a Singular Value Decomposition (SVD) of the higher-order derivatives of the original and the Riesz transformed signals. We further show that the expected responses of even and odd symmetric filters from the Riesz transform may be represented by a single signal autocorrelation function, which is beneficial in simplifying Bayesian computations for spatial orientation. Importantly, the Riesz transform allows one to weight linearly across orientation using both symmetric and asymmetric filters to account for some perceptual phase distortions observed in image signals - notably one's perception of edge structure within plaid patterns whose component gratings are either equal or unequal in contrast. Finally, exploiting the benefits that arise from the Riesz definition of local energy as a scalar quantity, we demonstrate the utility of Riesz signal representations in estimating the spatial orientation of second-order image signals. We conclude that the Riesz transform may be employed as a general tool for 2-D visual pattern recognition by its virtue of representing phase, orientation and energy as orthogonal signal quantities.

On a distinction between casual and formative variable models:theoretical issues and practical implications for organizational researchers

Formative measurement has seen increasing acceptance in organizational research since the turn of the 21st Century. However, in more recent times, a number of criticisms of the formative approach have appeared. Such work argues that formatively-measured constructs are empirically ambiguous and thus flawed in a theory-testing context. The aim of the present paper is to examine the underpinnings of formative measurement theory in light of theories of causality and ontology in measurement in general. In doing so, a thesis is advanced which draws a distinction between reflective, formative, and causal theories of latent variables. This distinction is shown to be advantageous in that it clarifies the ontological status of each type of latent variable, and thus provides advice on appropriate conceptualization and application. The distinction also reconciles in part both recent supportive and critical perspectives on formative measurement. In light of this, advice is given on how most appropriately to model formative composites in theory-testing applications, placing the onus on the researcher to make clear their conceptualization and operationalisation.

Mathematical Model and Simulation of a Pneumatic Apparatus for In-Drilling Alignment of an Inertial Navigation Unit during Horizontal Well Drilling

Conventional methods in horizontal drilling processes incorporate magnetic surveying techniques for determining the position and orientation of the bottom-hole assembly (BHA). Such means result in an increased weight of the drilling assembly, higher cost due to the use of non-magnetic collars necessary for the shielding of the magnetometers, and significant errors in the position of the drilling bit. A fiber-optic gyroscope (FOG) based inertial navigation system (INS) has been proposed as an alternative to magnetometer -based downhole surveying. The utilizing of a tactical-grade FOG based surveying system in the harsh downhole environment has been shown to be theoretically feasible, yielding a significant BHA position error reduction (less than 100m over a 2-h experiment). To limit the growing errors of the INS, an in-drilling alignment (IDA) method for the INS has been proposed. This article aims at describing a simple, pneumatics-based design of the IDA apparatus and its implementation downhole. A mathematical model of the setup is developed and tested with Bloodshed Dev-C++. The simulations demonstrate a simple, low cost and feasible IDA apparatus.

Eigen-Adaptation and Distributed Representation of 2-D Phase, Energy, Scale and Orientation in Spatial Vision

Distributed representations (DR) of cortical channels are pervasive in models of spatio-temporal vision. A central idea that underpins current innovations of DR stems from the extension of 1-D phase into 2-D images. Neurophysiological evidence, however, provides tenuous support for a quadrature representation in the visual cortex, since even phase visual units are associated with broader orientation tuning than odd phase visual units (J.Neurophys.,88,455–463, 2002). We demonstrate that the application of the steering theorems to a 2-D definition of phase afforded by the Riesz Transform (IEEE Trans. Sig. Proc., 49, 3136–3144), to include a Scale Transform, allows one to smoothly interpolate across 2-D phase and pass from circularly symmetric to orientation tuned visual units, and from more narrowly tuned odd symmetric units to even ones. Steering across 2-D phase and scale can be orthogonalized via a linearizing transformation. Using the tiltafter effect as an example, we argue that effects of visual adaptation can be better explained by via an orthogonal rather than channel specific representation of visual units. This is because of the ability to explicitly account for isotropic and cross-orientation adaptation effect from the orthogonal representation from which both direct and indirect tilt after-effects can be explained.

A hálózati pozíció és a versenyképesség kapcsolata (Business networks: network position and competitiveness in Hungary)

A cikk fókuszában az üzleti hálózatok állnak. Az IMP-csoport (Industrial Marketing and Purchasing Group) üzleti kapcsolatokkal, üzleti hálózatokkal foglalkozó több évtizedes kutatási eredményeire és fogalomrendszerére építve a szerzők áttekintik a téma alapvető megközelítéseit, majd a Versenyképesség-kutatás 2009. évi felmérésének adatait Felhasználva, megvizsgálják a vállalatvezetők által észlelt hálózati pozíció és a versenyképesség összefüggéseit. A vállalatvezetők értékelése szerint elemzik az iparági hálózatukban központi szerepet játszó, befolyással bíró (domináns hálózati pozícióval rendelkező) vállalatokat, különös tekintettel az üzleti teljesítmény és a versenyképesség jellemzőire. / === / The paper analyses the business network position of Hungarian companies, based on data of the Competitiveness research program. After an overview of the theoretical background of business relationships, business networks and network position – based on the IMP (Industrial Marketing and Purchasing Group) approach, the authors analyse the performance and competitiveness characteristics of firms with central position in their industrial network.

Üzleti hálózatok – Hálózati pozíció és versenyképesség = Business networks: network position and competitiveness in Hungary

Tanulmányunk fókuszában az üzleti hálózatok állnak. Az IMP csoport (Industrial Marketing and Purchasing Group) üzleti kapcsolatokkal, üzleti hálózatokkal foglalkozó több évtizedes kutatási eredményeire és fogalomrendszerére alapozva áttekintjük a téma alapmegközelítéseit, majd a Versenyképesség-kutatás 2009. évei felmérése adatainak felhasználásával vizsgáljuk a hálózati kép és a versenyképesség összefüggéseit. Jellemezzük a vállaltvezetők értékelése szerint az iparági hálózatukban központi szerepet játszó, befolyással bíró (domináns hálózati pozícióval rendelkező) vállalatokat, különös tekintettel az üzleti teljesítmény és versenyképesség jellemzőire. ________ The paper analyses the business network position of Hungarian companies, based on data of the Competitiveness research program. After an overview of the theoretical background of business relationships, business networks and network position – based on the IMP (Industrial Marketing and Purchasing Group) approach, we analyse the performance and competitiveness characteristics of firms with central position in their industrial network.

Az ellátási láncban elfoglalt pozíció és a szolgálatosodás – üzleti modellek Európában (Supply chain position and servitization – business models in Europe)

A szerzők célja, hogy megvizsgálják, milyen kölcsönhatásban áll az ellátási láncban elfoglalt pozíció, valamint a szolgálatosodás szintje az európai termelővállalatoknál. Vizsgálatuk azt mutatja, hogy a globalizáció és a termelés nemzetközivé válása mindkét tényezőt jelentős mértékben befolyásolja. A termelés globalizációs trendjeinek megfelelően így a kelet-európai (fejlődő), illetve a nyugat-európai (fejlett) országokban eltérő üzleti modellek válnak dominánssá, amelyek különböző ellátásilánc-pozícióval és más-más szintű szolgáltatásnyújtással jellemezhetőek. A domináns üzleti modellek mellett természetesen más üzleti modellek is működőképesnek bizonyulhatnak a két vizsgált régióban. A létesítmények elhelyezésére, valamint az üzleti eredményességre vonatkozó mutatók elemzésbe történő bevonásával cikkük az Európában működő üzleti modellek kialakításának okára, valamint jövőbeli fenntarthatóságára is megpróbál választ adni. __________ The objective of this paper is to examine the relationship between supply chain position and level of servitization in European manufacturing companies. The analysis shows that globalization and internationalization of production has dramatic impact on both phenomena. Due to the globalization trends different business models became dominant in the less developed Eastern-European and the more developed Western European countries, which can be characterized by different supply chain position and servitization level. Certainly other business models can also be successful in the two regions. Involving facility location motivations and business performance indicators the article shed light on the reasons of why these business models came alive and how sustainable they can be.

Supply chain position and servitization efforts of companies in Eastern and Western Europe

Our paper investigates the supply chain position of manufacturing companies in Europe, and the relation of this position to the extent and kind of services these companies provide. Our research builds on analyzing differences between Western and Eastern European companies. For the empirical research the database from the fifth round of the International Manufacturing Strategy Survey is used which covers 445 manufacturing companies from 13 European countries. Based on the connection between supply chain position and the extent and type of services offered dominant business models are identified both in Eastern and Western Europe.

Variable responses within epiphytic and benthic microalgal communities to nutrient enrichment

We examined the spatial extent of nitrogen (N) and phosphorus (P) limitation of each of the major benthic primary producer groups in Florida Bay (seagrass, epiphytes, macroalgae, and benthic microalgae) and characterized the shifts in primary producer community composition following nutrient enrichment. We established 24 permanent 0.25-m2 study plots at each of six sites across Florida Bay and added N and P to the sediments in a factorial design for 18 mo. Tissue nutrient content of the turtlegrass Thalassia testudinum revealed a spatial pattern in P limitation, from severe limitation in the eastern bay (N:P > 96:1), moderate limitation in two intermediate sites (approximately 63:1), and balanced with N availability in the western bay (approximately 31:1). P addition increased T. testudinum cover by 50-75% and short-shoot productivity by up to 100%, but only at the severely P-limited sites. At sites with an ambient N:P ratio suggesting moderate P limitation, few seagrass responses to nutrients occurred. Where ambient T. testudinum tissue N:P ratios indicated N and P availability was balanced, seagrass was not affected by nutrient addition but was strongly influenced by disturbance (currents, erosion). Macroalgal and epiphytic and benthic microalgal biomass were variable between sites and treatments. In general, there was no algal overgrowth of the seagrass in enriched conditions, possibly due to the strength of seasonal influences on algal biomass or regulation by grazers. N addition had little effect on any benthic primary producers throughout the bay. The Florida Bay benthic primary producer community was P limited, but P-induced alterations of community structure were not uniform among primary producers or across Florida Bay and did not always agree with expected patterns of nutrient limitation based on stoichiometric predictions from field assays of T. testudinum tissue N:P ratios.