Shaping a Corporate Identity From Below; the Role of the BAT Bulletin.

Existing studies that have explored the use of company journals as a mode of corporate communication during the early 20th century have invariably adopted an instrumentalist view of these publications. Company journals have been seen as a means of projecting to employees a top-down view of organisations. This article identifies a counter-example in which the origins of a company journal, the 'Bat Bulletin', are seen to arise as the result of an initiative stemming from the employees themselves. These antecedents gave the 'Bat Bulletin' a high degree of legitimacy amongst staff and provided the company with an important means of establishing a unified corporate culture across a disparate group international operating companies. Over time, however, the contents of the journal gradually became more conventional, and it was eventually closed down when the strategy of international integration ceased to be a desirable corporate objective during the 1930's

Two-spinon dynamic structure factor of the one-dimensional S=1/2 Heisenberg antiferromagnet

The exact expression derived by Bougourzi, Couture, and Kacir for the 2-spinon contribution to the dynamic spin structure factor $S_{zz}(q,\omega)$ of he one-dimensional $S$=1/2 Heisenberg antiferromagnet at $T=0$ is evaluated for direct comparison with finite-chain transition rates ($N\leq 28$) and an approximate analytical result previously inferred from finite-$N$ data, sum rules, and Bethe-ansatz calculations. The 2-spinon excitations account for 72.89% of the total intensity in $S_{zz}(q,\omega)$. The singularity structure of the exact result is determined analytically and its spectral-weight distribution evaluated numerically over the entire range of the 2-spinon continuum. The leading singularities of the frequency-dependent spin autocorrelation function, static spin structure factor, and $q$-dependent susceptibility are determined via sum rules.Comment: 6 pages (RevTex) and 5 figures (Postscript

Critical properties of 1-D spin 1/2 antiferromagnetic Heisenberg model

We discuss numerical results for the 1-D spin 1/2 antiferromagnetic Heisenberg model with next-to-nearest neighbour coupling and in the presence of an uniform magnetic field. The model develops zero frequency excitations at field dependent soft mode momenta. We compute critical quantities from finite size dependence of static structure factors.Comment: talk given by H. Kr{\"o}ger at Heraeus Seminar Theory of Spin Lattices and Lattice Gauge Models, Bad Honnef (1996), 20 pages, LaTeX + 18 figures, P

Absorção, translocação e utilização de zinco, cobre e manganês por mudas enxertadas de Coffea arabica Absorption, translocation and utilization of zinc, copper and manganese in grafted seedlings of Coffea arabica

Comparativamente ao pé-franco, a combinação enxerto/porta-enxerto altera os complexos mecanismos de "feedback" entre parte aérea e raízes, afetando de maneira positiva ou negativa a eficiência nutricional da planta. Este trabalho teve como objetivo avaliar, em cultivo hidropônico, a eficiência da absorção, translocação e utilização de Zn, Cu e Mn por mudas de Coffea arabica L., de acordo com o porta-enxerto utilizado. O experimento foi realizado em casa de vegetação, por um período de 170 dias, em vasos que continham areia como substrato, recebendo solução nutritiva circulante. Utilizaram-se, como enxerto, quatro genótipos de C. arabica: os cultivares Catuaí Vermelho IAC 15 e Oeiras MG 6851 e os híbridos 'H 419-10-3-1-5' e 'H 514-5-5-3' , e, como porta-enxerto, quatro genótipos, sendo três de Coffea canephora Pierre ex Froenher: Apoatã LC 2258, Conilon Muriaé-1 e RC EMCAPA 8141 (recombinação entre clones da variedade Robustão Capixaba - EMCAPA 8141) e uma linhagem de Coffea arabica L.: Mundo Novo IAC 376-4, além de quatro pés-francos. O delineamento experimental utilizado foi em blocos casualizados com 20 tratamentos, quatro repetições e uma planta por parcela. A eficiência nutricional das mudas quanto ao Zn, Cu e Mn variou de acordo com a combinação enxerto/porta-enxerto. A progênie 'H 514-5-5-3' foi mais eficiente quanto à utilização de Zn, Cu e Mn e produção de matéria seca, quando combinada com os porta-enxertos Apoatã LC 2258 e Mundo Novo IAC 376-4. O Catuaí Vermelho IAC 15 foi mais eficiente na utilização de Cu e Mn quando combinado com Apoatã LC 2258.<br>There are complexes feedback mechanisms involving the relationship rootstock/scion, whick can positively or negatively affect the plant nutrient efficiency use. The goal of the present work was to evaluate the efficiency of uptake, translocation and utilization of Zn, Cu and Mn in coffee seedlings. The experiment was carried out in a greenhouse over 170 days using circulating nutrient solution in pots with sand medium. Four Coffea arabica L. genotypes were used as grafts: Catuaí Vermelho IAC 15 and Oeiras MG 6851, and the hybrids 'H 419-10-3-1-5' and 'H 514-5-5-3' . Three genotypes of Coffea canephora Pierre et Froenher were used as rootstocks: Apoatã LC 2258, Conilon Muriaé-1 and RC EMCAPA 8141 (recombination among clones of the variety Robustão Capixaba - EMCAPA 8141), one line of C. arabica: Mundo Novo IAC 376-4, and four additional non-grafted plants. The experiment was in a randomized block design with 20 treatments, four replications and one plant per plot. The nutritional efficiency of the coffee seedlings for Zn, Cu and Mn varied according to the graft/rootstock combination. Progeny 'H 514-5-5-3' proved to be the most effective regarding Zn, Cu and Mn utilization and dry matter yield when combined with the rootstocks Apoatã LC 2258 and Mundo Novo IAC 376-4. Catuaí Vermelho IAC 15 was more effective for Cu and Mn utilization when combined with Apoatã LC 2258