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公司必须将IT视为实现碳减排达标的重要组成部分,当下的观望态度会令他们日后陷入巨大的竞争劣势     

Influence of reaction conditions on the formation of nanotubes/nanoparticles of polyaniline in the presence of 1‐amino‐2‐naphthol‐4‐sulfonic acid and applications as electrostatic charge dissipation material

BACKGROUND: Poly(1‐amino‐2‐naphthol‐4‐sulfonic acid) and its copolymers with aniline are a new class of conducting polymers which can acquire intrinsic protonic doping ability, leading to the formation of highly soluble self‐doped homopolymers and copolymers. Free ? OH and ? NH₂ groups in the polymer chain can combine with other functional groups that could be present in protective paints which can thus be successfully used as antistatic materials. RESULTS: This paper reports the formation of nanotubes of polyaniline on carrying out oxidative polymerization of aniline in the presence of 1‐amino‐2‐naphthol‐4‐sulfonic acid (ANSA) in p‐toluenesulfonic acid (PTSA) as an external dopant. The presence of ? SO₃H groups in the ANSA comonomer allows the copolymer to acquire intrinsic protonic doping ability. The polymerization mechanism was investigated by analysing the ¹H NMR, ¹³C NMR, Fourier transform infrared and X‐ray photoelectron spectra of the copolymers and homopolymers, which revealed the involvement of ? OH/? NH₂ in the reaction mechanism. Scanning and transmission electron microscopy showed how the reaction route and the presence of a dopant can affect the morphology and size of the polymers. Static decay time measurements were also carried out on conducting copolymer films prepared by blending of 1 wt% of copolymers of ANSA and aniline with low‐density polyethylene (LDPE) which showed a static decay time of 0.1 to 0.31 s on dissipating a charge from 5000 to 500 V. CONCLUSION: Copolymers of ANSA with aniline were synthesized in different reaction media, leading to the formation of nanotubes and nanoparticles of copolymer. Blends of 1 wt% of PTSA‐ and self‐doped copolymers of ANSA and aniline with LDPE can be formulated into films with effective antistatic properties. Copyright © 2009 Society of Chemical Industry     

An LFT approach to parameter estimation

In this paper we consider a unified framework for parameter estimation problems. Under this framework, the unknown parameters appear in a linear fractional transformation (LFT). A key advantage of the LFT problem formulation is that it allows us to efficiently compute gradients, Hessians, and Gauss–Newton directions for general parameter estimation problems without resorting to inefficient finite-difference approximations. The generality of this approach also allows us to consider issues such as identifiability, persistence of excitation, and convergence for a large class of model structures under a single unified framework.     

In-situ synthesis and rapid consolidation of fully dense MoSi2

Fully dense, large-grained MoSi₂ samples can be fabricated by self-propagating high-temperature synthesis (SHS) and rapid consolidation using the Ceracon process. Using this process, several major limitations associated with SHS/hot isostatic pressing to fabricate MoSi₂ are overcome.     

Decision Making in the Battlefield-of-Things

Wireless Personal Communications - This paper accentuates the paradigm shift in battlefield-environments. In perspective of a decision-maker to enable shrinking of his decision-cycle, the...     

Conceptualizing development in information and communication technology for development (ICT4D)

ABSTRACT

ICT4D research is faced with the challenge of rapidly changing technologies and increasingly complex social dynamics and development processes. We argue that ICT4D research requires a more acute sense of where our research is situated within a broader picture of development, e.g. with a better understanding of development processes, their ideological nature, the power structures and driving forces, and the mechanisms through which ICTs may be embedded in and shape these processes. Such a reflexivity is crucial not least in justifying our claims of contribution, but also in understanding the implications and potential impact of our research and practice. This editorial seeks to explore key conceptual components in ICT4D and their relationships, including dimensions of development, perspectives of development, conceptions of artefacts, and theory of change. A tentative conceptual schema is presented that connects these conceptual components.     

Early clinical outcomes after small incision lenticule extraction surgery (SMILE)

Purpose

Dry eye is known to impact on clinical outcomes after laser vision correction and the use of a newer ‘all femtosecond laser’ surgical approach may be associated with less impact on the ocular surface post-operatively. The purpose of this study was to evaluate the early clinical outcomes and tear instability after the first small incision lenticule extraction (SMILE) cases undertaken by three surgeons at a single site in the UK.

Role of ICTs in participatory development: An Indian experience

Participation of local communities has been important at least in two domains: (a) rural development processes in developing countries and (b) information systems design. The issue of participation becomes especially important in the contemporary contexts in which the use of information and communication technologies (ICTs) is being integrated within rural development initiatives in developing countries, for example in e-governance. This article attempts to synthesize the issues around participation from both IS and development studies literature in order to identify four key problematic areas: viz., (a) who defines the participation agenda, (b) what capabilities do stakeholders have to participate and how can this be strengthened, (c) what is the role of institutional conditions in enabling effective participation, and (d) how do local participatory processes experiences get integrated into broader networks to become sustainable. These four themes provide a theoretical framework to analyze how the use of ICTs is reconfiguring the dynamics between participation, rural development, and ICTs. This framework is applied in the context of an ICT initiative for rural development in India. Implications for both theory and practice are developed based on the need to judiciously integrate both structural and behavioral approaches to participation. © 2007 Wiley Periodicals, Inc.     

HIV/AIDS reporting systems in Mozambique: The theoretical and empirical challenges of “representations”

Acquired immunodeficiency syndrome is a disease with profound effects on the global society, as it affects individual lives, communities, societies, and even nations. As governments try to gear up on the war against this pandemic, an issue of importance pertains to the use of information systems. The systems are used to collect data on the prevalence of the disease, and analyze and transmit the data from the lower levels of the health administration where the testing is done to the higher levels of national policy making where different kinds of interventions are designed. In this article, we argue that the manner in which the representation of the disease is constructed is an important area of concern as it shapes the picture of the disease prevalence and influences how these statistics then get used for the planning of interventions such as supplying drugs and pro-health campaigns. Drawing from the domain of Science and Technology Studies (STS), with a focus on Bruno Latour's (1999) ideas of “circulating reference” we first develop the theoretical notion of representation, and then apply it to an empirical analysis of the reporting systems, both paper- and computer-based, of HIV/AIDS in Mozambique. The successive movements of information about HIV/AIDS prevalence across the various administrative levels are seen as translations that are being constructed through the communication and work practices of the health care workers at different levels, and are shaped by the political interests of the different stakeholders involved, including international agencies and national health authorities. Latour's notion of circulating reference is drawn upon to analyze the question of what is lost, what is gained, and what remains invariant through the successive stages of translation in the construction and use of the representation. © 2005 Wiley Periodicals, Inc.