Neo-Marshallian Nodes, Global Networks and Firm Competitiveness: The Media Cluster of Central London

The recent emphasis by some business scholars on processes taking place within locally-embedded production systems seems to undervalue the dynamics of global competition and the role played by TNCs in mobilising tangible and intangible assets across localised clusters. Using the external linkages of firms as the theoretical framework, this paper examines the interplay between global and local influences on the competitiveness of the cluster of media firms in Central London. The main findings are that the locality indeed plays a vital role in influencing the capabilities of these firms, but it is by no means the only relevant geographic area. This localised cluster is bound tightly into world-wide webs of interdependence, with TNCs playing a major role in mediating between local and global linkages. The latter are vital for the ability of the firms studied to compete successfully in international markets.

Why Do Business Service Firms Cluster? Small Consultancies, Clustering and Decentralisation in London and Southern England

Notwithstanding their remarkable recent growth, surprisingly little research has hitherto been conducted on the evolving geography of professional and business services in Britain. This paper analyses the results of a detailed survey of 300 small and medium-sized management and engineering consultancies, in investigating the forces underpinning both the striking clustering of such firms in central London and their growth in decentralised locations of East Anglia and South West England. Particular attention is paid to the role of demand-side influences, localised 'collective learning' processes, and increasing globalisation in clustering, and to so called 'enterprising behaviour theory' in explaining decentralisation.business services, clustering London, globalisation, SMEs, collective learning

Foreign and Indigenous Firms in the Media Cluster of Central London

This study uses the comparison between foreign and indigenous firms in localised clusters to gain insights into the behaviour of the former in clusters. In-depth study of 49 foreign and indigenous media firms in the soho district of central london suggests a combination of differences and similarities between them in terms of their cluster behaviour and the benefits they draw from their cluster participation. The major factor determining these differences and similarities is the extent to which internal linkages within tncs substitute for cluster linkages.tncs, clusters, media industries

External networks and geographic clustering as sources of MNE advantages: Foreign and indigenous professional service firms in Central London

This study combines the theories of international business and management with network theory in order to examines the networking activities of foreign affiliates. It focuses on a specific kind of network, which is taking place between firms based in geographic proximity. A comparative analysis between foreign and indigenous firms in selected professional service industries located in Central London is used as the analytical tool to isolate the networking attributes of firms in general from those that are unique to foreign affiliates and emerge as a result of their specific characteristics. The findings suggest considerable differences between foreign and indigenous firms in terms of their network behaviour. MNE internal networks appear partially to replace the advantages provided by external networks, acting both to diminish the MNE's need for external linkages and channel it into somewhat different directions.networking, Multinational Enterprises, geographic clustering, Professional service firms, London

Electron paramagnetic resonance studies of spin-labelled ethidium bromide DNA interactions

Spin-Labelled Ethidium Bromide (SLEB) was prepared in order to study its interactions with natural DNA in the form of fibres . The technique of electron paramagnetic resonance was used in this thesis. Knowledge of the conformational transition pathway of natural DNA for given counterion concentration as a function of relative humidity was utilised in the study of effect DNA confomation on the binding of SLEB. To aid interpretation of the results the relevant background material was reviewed. In order to attempt to extract geometric information on binding computer ERR lineshape simulations were used. To facilitate this a microcomputer spectrometer control system was designed and implemented. This allowed spectra to be acquired in digital form and transfered to the mainframe computer. Two schemes for magnetic field control were investigated, one based on a commercial NMR magnetometer, and a superior pulsed NMR field locking magnetometer developed in this laboratory. In order to obtain lineshapes undistorted by dipolar broadening it is advantageous to use fibres with a high phosphate to drug ratio (P/D), however spectrometer sensitivity becomes a limiting factor. A review of noise in spectrometer systems is included. The use of a microwave low-noise preamplifer to reduce the system noise figure was investigated. An attempt to construct a loop-gap resonator was made and justified theoretically. A 35GHz spectrometer was constructed and a cavity designed and built to allow the humidity to be varied. The system was made compatible with the control system. Spectra recorded and simulated at this frequency should help confirm those obtained at 9GHz. The results obtained from P/D«70 fibres with a 0.5mM NaCl concentration show the SLEB is in a disordered state from 33% to 75% relative humidity. Spectral changes occur in the range 75% to 98% consistant with intercalation. In this humidity range a transition to the B-form is expected

Studies on metal alkoxides and carboxylates for use as catalyst precursors

This thesis describes research carried out to investigate the feasibility of preparing high activity heterogeneous catalysts from the thermal decomposition of mixed metal alkoxides, carboxylates and hydroxycarboxylates, focusing in particular on the Cu/ZnO/Al(_2)0(_3) methanol synthesis catalyst. The rationale behind the project is discussed in the opening chapter of the thesis which is followed by literature reviews of heterogeneous catalysis and the chemistry of metal alkoxides, carboxylates and hydroxycarboxylates. Series of co-precipltation/crystallisation reactions of copper and zinc formates, oxalates and adipates were carried out as potential routes to double salts, Some such compounds were formed but in most cases mixtures of the individual salts resulted (xrd).Thermal decompositions of alkoxides and carboxylates of copper and zinc were investigated both as separate compounds and as mixtures. The nature of volatile species evolved (gas-phase ir) and of the solid residues (microanalysis, xrd) was different for the mixed decompositions compared to the individual ones, The conditions employed in decompositions of copper (II) formate with zinc methoxide (e.g. under vacuum or a stream of or N(_2) or N(_2)/H(_2)) affected the physical nature of the copper metal/zinc oxide residues, smallest particles resulting when using a N(_2) stream (transmission electron microscopy). Some of these materials showed activity for methanol synthesis. The reaction of soluble copper alkoxides (e.g. Cu(_I)0Bu) with anhydrous zinc 2-hydroxybenzoate, Zn(OzCCeH*(OH))^, led to the formation of apparently mixed metal compounds, for example CuZn(0(_2)CC(_6)H(_4)0)(_2)Py. The preparation of a new soluble alkoxy derivative of zinc is also reported: Li(_2)ZnCl(_2)(0CH(_2)CH(_2)(X:H(_2)CH(_2)0CH(_3))(_2).A summary of the results of the experimental work is given in relation to the project as a whole

Regional collective learning processes, innovation and growth of high technology SMEs: The case of the Cambridge region

Recent theoretical research on the technological development of dynamic European regions has drawn attention to the supposedly key role of "untraded interdependencies" between local firms and other organisations (Storper, 1995), involving informal inter-firm networking (Yeung, 1994) and processes of "collective learning" (Camagni, 1991, Lorenz, 1992). These processes, which involve exchange and development of technological expertise, are seen as being based on relationships of trust and reciprocity, while the networks and processes themselves are viewed as influential in the recent evolution of dynamic regional clusters of innovative small and medium sized enterprises. The paper will attempt to assess the extent, importance and nature of collective learning processes in the specific caseof technology-intensive firms in the Cambridge region recenty descried as the "nearest thing in Europe to Silicon Valley" (Martin 1996). Based on an original interview survey of technology-based enterprises, the paper will asses the role of technology firm spin-off and acquistion, inter-firm research and technology collaboration, and scientific and professional labour market recruitment, in the development of local technological competencies and collective learning capabilities. Alltention will also be paid to the role of key local instiutions and supporting business services in this regard. The paper will conclude by condsidering implications for policy.

Bifurcated polarization rotation in bismuth-based piezoelectrics

ABO3 perovskite-type solid solutions display a large variety of structural and physical properties, which can be tuned by chemical composition or external parameters such as temperature, pressure, strain, electric, or magnetic fields. Some solid solutions show remarkably enhanced physical properties including colossal magnetoresistance or giant piezoelectricity. It has been recognized that structural distortions, competing on the local level, are key to understanding and tuning these remarkable properties, yet, it remains a challenge to experimentally observe such local structural details. Here, from neutron pair-distribution analysis, a temperature-dependent 3D atomic-level model of the lead-free piezoelectric perovskite Na0.5Bi0.5TiO3 (NBT) is reported. The statistical analysis of this model shows how local distortions compete, how this competition develops with temperature, and, in particular, how different polar displacements of Bi3+ cations coexist as a bifurcated polarization, highlighting the interest of Bi-based materials in the search for new lead-free piezoelectrics