Green ideas travelling across organizational boundaries

In the last few decades, environmental commitment has become a powerful discursive means of mobilizing actors and developing distinct organizational identity. However, the prevalent uncertainty in society concerning the interpretation and operationalization of concepts, such as ‘green’, ‘sustainable’, ‘environment’ and ‘ecology’ allows for interpretative flexibility. Accordingly, individual members or groups of members in organizations operationalize the concept green in ways that make sense to their working contexts' specific ontology, epistemology and ideology. Based on a comparative case study of three Swedish municipal housing companies, the paper examines how green ideas are translated as they travel across organizational boundaries, and how these notions become embedded within different organizational processes, and thus set external as well as internal boundaries. The underlying assumption is that the meaning of ‘green’ shifts depending on which organization and sphere of society is in perspective. Therefore, the paper traces spatial shifts in meanings of ‘green’ as these travel across organizational boundaries, from the local governmental authority, via the Parent company, to the three individual companies studied. Comparing the companies' official environmental statements with the organizational members' representations of green shows discrepancies in talk and action, which may have implications for the companies' internal identity as well as for the creation of an external image. Furthermore, these discrepancies are traced to different communities of action and practice, i.e. those who make strategic environmental decisions in the companies are not the same as those who possess environmental expertise.

Au cours de ces dernières années, les préoccupations environnementales sont devenues un puissant moyen discursif de mobilisation des acteurs et de développement d'une identité organisationnelle distincte. Or, l'incertitude qui règne dans la société en ce qui concerne l'interprétation et l'exploitation de concepts tels que «vert», «durable», «environnement» et «écologie» autorise une certaine souplesse. En conséquence, des membres individuels ou des groupes de membres d'organisations exploitent le concept «vert» de manière à donner du sens à l'ontologie, à l'épistémologie et à l'idéologie propres au contexte de travail. S'appuyant sur une étude de cas comparative de trois entreprises suédoises de construction de logements municipaux, l'auteur de cet article examine comment les concepts écologiques se transforment lorsqu'ils traversent des frontières à l'intérieur des organisations et comment ces notions s'inscrivent dans différents processus organisationnels et fixent ainsi des limites externes et internes. L'hypothèse sous-jacente est que la notion de « vert » se déplace en fonction de l'organisation et de la sphère de la société mises en perspective. Cet article retrace donc ces déplacements dans l'espace de la signification du concept «vert» lorsqu'il traverse des limites organisationnelles, de l'administration locale, via la société-mère, jusqu'aux trois entreprises individuelles étudiées. Lorsque l'on compare les déclarations environnementales officielles de ces entreprises au concept de «vert» affiché par les membres des organisations, on voit apparaître des différences dans le discours et dans l'action qui peuvent avoir des incidences sur l'identité interne des entreprises et sur la création d'une image externe. En outre, on fait remonter ces différences jusqu'aux différentes communautés d'action et de pratique, c'est-à-dire que celles qui prennent des décisions environnementales stratégiques ne sont pas les mêmes que celles qui possèdent les compétences en matière d'environnement.

Mots clés: Communauté d'action, communauté de pratiques, bâtiments verts, construction de l'identité, innovation, culture de l'organisation, mise en oeuvre des politiques, donner du sens, déplacement des idées     

Inductive Learning with a Computational Network

This paper introduces a computational network which combines heterogeneous rule-extraction algorithms for intelligent data analysis. Combining induction programs may alleviate the possible negative effects of data set representation and individual program's influences, such as inductive bias. The application of the computational network to a diabetes data set shows that, when combining the various programs, an increase in rule set accuracy and comprehensibility are obtained.     

A survey of electric and magnetic fields among VDT operators inoffices

The ambient electric and magnetic fields as well as the electromagnetic fields associated with video display terminals (VDTs) at 150 offices are measured. The aim of the study is to determine the general level of the various electromagnetic parameters in offices and establish a technical base for a case referent study of skin symptoms among VDT workers. The median value of the 50-Hz background field in the 150 offices is 0.07 μT. Seven of the offices have background levels higher than 0.5 μT, which is high enough to cause distortion of the picture on the screen. The dominant source for electric fields in the ELF range is electric equipment in the office, not the VDTs. The equivalent surface potential is less than 0.5 kV for 63% of the measured VDTs. The computer monitor is a major source of magnetic fields in the offices. The median value of the magnetic field in the ELF range in front of the VDT is 0.21 μT, and in the VLF range it is 0.03 μT     

Limit velocity of fracture front and dynamic strength of brittle solids

The theories of propagation of brittle fracture fronts in solid materials are compared with experimental data. Instead of the well-known theory of the limit fracture stress the theory of limit velocity of fracture front is developed. Accordingly between the moving boundary at which the static strength is attained and the front of fracture the material can stand essential dynamic over-loadings. The experimental data on contained explosions in optically transparent intact blocks show that the limit velocity of brittle cracks front takes place immediately after the separation of the shock front and the front of brittle fracture. The hypothesis of the existence of limit front velocity leads to the conclusion that in the two-front structure of plane shock waves the amplitude of elastic precursors, known as “the Hugoniot elastic limit”, exceeds the value of ultimate static strength of a solid material and has to increase with increasing of a finite shock pressure. This effect is justified by a number of experiments with brittle materials. The analogue with the plane problem of a self-supporting brittle burst is shown. The explanation of exceeding of the ultimate static strength and of “the delay time” of fracture under the spall condition is given. The increasing of internal fractures, which is described by the dilatancy loosening of materials is discussed. The well-known laws of “the geometrical similarity” of contained explosions are in accordance with expression of the strength in terms of the ultimate stress but not in terms of Griffith's energy for creating of new cracks. The possibility of the regime of a limit front velocity of fracture at explosion motions in real rocks, for which the dilatancy has place, is discussed.     

Über die Ausbildung von Gittereigenverformungen in Stählen nach bleibender einachsiger Dehnung

Untersuchung von Eigenspannungen an zwei Stählen mit rd. 1,6% C und einem Gefüge aus Perlit und übereutektoidischem, teilweise netzförmig vorliegendem Zementit nach einachsiger bleibender Dehnung bis zu 2,3% mit röntgenographischen Messungen. Ausbildung von Druckeigenspannungen im Ferrit und Zugeigenspannungen im Zementit. Erklärung der Ergebnisse unter besonderer Berücksichtigung des scheinbaren Ungleichgewichtes zwischen Mikrozug- und -druckeigenspannungen.     

Isotopic variations of Zn in biological materials

Variations in the isotopic composition of Zn present in various biological materials were determined using high-resolution multicollector inductively coupled plasma mass spectrometry (MC-ICPMS), following digestion and purification by anion exchange chromatography. To correct for differences in instrumental mass discrimination effects between samples and standards, Cu was employed as an elemental spike. Complementary analyses of Zn separates by sector field ICPMS instruments revealed that the concentrations of the majority of potentially interfering elements were reduced to negligible levels. Residual spectral interferences resulting from (35)Cl(16)O(2)(+), (40)Ar(14)N(2)(+), and (40)Ar(14)N(16)O(+) could be instrumentally resolved from the (67)Zn, (68)Zn, and (70)Zn ion beams, respectively, during measurement by MC-ICPMS. The only other observed interference in the Cu and Zn mass range that could not be effectively eliminated by high-resolution multicollection resulted from (35)Cl(2)(+), necessitating modification of the sample preparation procedure to allow accurate (70)Zn detection. Complete duplication of the entire analytical procedure for human whole blood and hair, as well as bovine liver and muscle, provided an external reproducibility of 0.05-0.12 per thousand (2sigma) for measured delta(66/64)Zn, delta(67/64)Zn, and delta(68/64)Zn values, demonstrating the utility of the method for the precise isotopic analysis of Zn in biological materials. Relative to the selected Zn isotopic standard, delta(66/64)Zn values for biological samples varied from -0.60 per thousand in human hair to +0.56 per thousand in human whole blood, identifying the former material as the isotopically lightest Zn source found in nature to date.     

Isotopic fractionation during diffusion of transition metal ions in solution

Isotope ratios and elemental concentrations were measured in aqueous solutions sampled at varying distances from sources of Fe or Zn ions. The measurements reveal fractionation of isotopes resulting from pure diffusion in solution. Our data demonstrate that diffusion alone can cause changes in (56)Fe/(54)Fe and (66)Zn/(64)Zn isotope ratios in excess of -0.3 per thousand. These findings thus confirm previous suspicions that transport processes contribute to observed variations in isotopic compositions. Diffusion must therefore be considered when attempting to make inferences from isotope measurements on samples originating from aqueous systems where concentration gradients may develop.     

Structural Changes during Milling of Silicon Carbide

The kinetics of milling and structural changes during milling of commercial silicon carbide powder in a ball mill lined with hard alloy are studied. Data are provided for the specific surface, x-ray patterns, and infrared spectra. It is shown that milling kinetics are described best of all by an exponential relationship and that milling of silicon carbide powder is accompanied by changes in polytype composition. The x-ray patterns and infrared spectra obtained make it possible to assume that during milling the 15R polytype content in the powder composition decreases while the content of structures with less layering (the 4H polytype and -SiC) increases; in this case the number of absorption bands in the infrared spectra decreases.     

Development and optimization of a mid-infrared hollow waveguide gas sensor combined with a supported capillary membrane sampler

A gas sensor for application in water analysis was developed by combination of a mid-infrared (MIR) hollow waveguide with a Fourier transform infrared (FT-IR) spectrometer and coupling of the hollow waveguide gas sensor module to a supported capillary membrane sampler (SCMS) for continuous liquid-gas extraction. Different hollow waveguides have been characterized in this study for developing an optimized optical configuration. Analysis of industrially relevant compounds has been performed, investigating chlorinated hydrocarbons (CHCs), such as dichloromethane and chloroform, representing highly volatile analytes, and 1,4-dioxane as an example of target compounds with low volatility. The suitability of this spectroscopic IR sensing system for industrial applications is demonstrated under simulated real-world conditions with limits of detection in the ppb (v/v) and ppm (v/v) concentration range for CHCs and 1,4-dioxane, respectively.     

SAW COM-parameter extraction in AlN/diamond layered structures

Highly c-axis oriented aluminum nitride (AlN) thin piezoelectric films have been grown on polycrystalline diamond substrates by pulsed direct current (DC) magnetron reactive sputter-deposition. The films were deposited at a substrate temperature below 50/spl deg/C (room temperature) and had a typical full width half maximum (FWHM) value of the rocking curve of the AlN-002-peak of 2.1 degrees. A variety of one-port surface acoustic wave (SAW) resonators have been designed and fabricated on top of the AlN films. The measurements indicate that various SAW modes are excited. The SAW phase velocities of up to 11.800 m/s have been measured. These results are in agreement with calculated dispersion curves of the AlN/diamond structure. Finally, the coupling of modes parameters have been extracted from S/sub 11/ measurements using curve fitting for the first SAW mode, which indicate an effective coupling K/sup 2/ of 0.91% and a Q factor of about 600 at a frequency of 1050 MHz.