A crisis in the environment? The impact of polymers and adhesives

Polymers and composites in general, and surfaces, interfaces and adhesion in particular, are important and interesting areas of science with important technological applications. The polymer industry has shown broadly exponential growth since the middle of the last century and aspires to continued growth. Thus the science has contributed to the growth in prosperity and to the cognate problems, in particular environmental problems. There is a crisis which results from depletion of fossil fuels resources as raw materials and energy sources, and from pollution, especially greenhouse gas emissions. In this paper some of the ways are discussed in which these sciences can contribute to reduction of the environmental impact of the associated industries. Much can be done modifying existing procedures for example by replacing the use of organic solvents by aqueous systems, change of blowing agents and pretreatment chemicals. Interest in polymers from renewable resources such as starch, gelatine and natural rubber has intensified and new natural sources are being developed, some by use of fermentation techniques or genetic modification. Novel polymers and co-polymers from polysaccharides and based on polyhydroxyalkonates are being developed. There is much interest in "biorefineries", which can produce organic chemicals of significance to the polymer industry from a biomass feedstock. The management of polymer wastes is a difficult area and recycling while technically feasible, may not be environmentally attractive. In addressing the environmental impact of polymers and composites it is essential to consider the environmental impact from "cradle to grave". Such lifecycle analysis may show that some renewable resources or recycling techniques have a greater environmental impact than the technologies which they aspire to replace. The question remains as to whether these technical solutions, however successfully developed, will be adequate to resolve the environmental crisis described above. In theory, the Laws of Thermodynamics must cause reflection on the concept of indefinite growth within a finite system. In practice, the present global per caput energy usage coupled with projected population growth and global aspirations to a "North American" lifestyle must be compared with plausible estimates of material and energy reserves

Academic Freedom and 21st Century European Universities

It is argued that university education has a moral and social function in society. Its purpose is to provide a liberal education (developing the intellect by challenging it to grapple freely with difficult ideas), the development of new knowledge and the provision of trustworthy, disinterested research. To serve society in this way safeguards are necessary: a separation from the state, giving institutional autonomy and academic freedom in teaching and research. With the rise of extreme free market capitalism and the "knowledge society", these safeguards are being eroded: national governments, partly through the ramifications of the Bologna convergence process, are in the process of moulding universities to the needs of the market, and now see the accommodation of students to the workplace as the principal, or indeed only, objective for a university education. Example of the consequences of these changes are discussed, including the corruption of research integrity and erosion of individual liberties

High Resolution Imaging of the Magnetic Field in the central parsec of the Galaxy

We discuss a high resolution (FWHM~ 0.45 arcsec) image of the emissive polarization from warm dust in the minispiral in the Galactic Centre and discuss the implications for the magnetic field in the dusty filaments. The image was obtained at a wavelength of 12.5 microns with the CanariCam multimode mid-infrared imager on the Gran Telescopio Canarias. It confirms the results obtained from previous observations but also reveals new details of the polarization structures. In particular, we identify regions of coherent magnetic field emission at position angles of ~45 deg to the predominantly north--south run of field lines in the Northern Arm which may be related to orbital motions inclined to the general flow of the Northern Arm. The luminous stars that have been identified as bow-shock sources in the Northern Arm do not disrupt or dilute the field but are linked by a coherent field structure, implying that the winds from these objects may push and compress the field but do not overwhelm it. The magnetic field in the the low surface brightness regions in the East-West Bar to the south of SgrA* lies along the Bar, but the brighter regions generally have different polarization position angles, suggesting that they are distinct structures. In the region of the Northern Arm sampled here, there is only a weak correlation between the intensity of the emission and the degree of polarization. This is consistent with saturated grain alignment where the degree of polarization depends on geometric effects, including the angle of inclination of the field to the line of sight and superposition of filaments with different field directions, rather than the alignment efficiency.Comment: 9 pages, 3 figures, Proceedings of Cosmic Dust X, held in Mitaka, Japan in August 201

HST and Spitzer point source detection and optical extinction in powerful narrow-line radio galaxies

We present the analysis of infrared HST and Spitzer data for a sample of 13 FRII radio galaxies at 0.03<z<0.11 that are classified as narrow-line radio galaxies (NLRG). In the context of the unified schemes for active galactic nuclei (AGN), our direct view of the AGN in NLRG is impeded by a parsec-scale dusty torus structure. Our high resolution infrared observations provide new information about the degree of extinction induced by the torus, and the incidence of obscured AGN in NLRG. We find that the point-like nucleus detection rate increases from 25 per cent at 1.025$\mu$m, to 80 per cent at 2.05$\mu$m, and to 100 per cent at 8.0$\mu$m. This supports the idea that most NLRG host an obscured AGN in their centre. We estimate the extinction from the obscuring structures using X-ray, near-IR and mid-IR data. We find that the optical extinction derived from the 9.7$\mu$m silicate absorption feature is consistently lower than the extinction derived using other techniques. This discrepancy challenges the assumption that all the mid-infrared emission of NLRG is extinguished by a simple screen of dust at larger radii. This disagreement can be explained in terms of either weakening of the silicate absorption feature by (i) thermal mid-IR emission from the narrow-line region, (ii) non-thermal emission from the base of the radio jets, or (iii) by direct warm dust emission that leaks through a clumpy torus without suffering major attenuation.Comment: 18 pages, 7 figures, 8 tables, accepted for publication in MNRA

Birefringence and transmission of an antireflection-coated sulfur-free cadmium selenide Wollaston prism at 30 K

We present a determination of the change with temperature and wavelength of the degree of birefringence of a cold (similar to 30K) Wollaston prism constructed from antireflection (AR)-coated sulfur-free cadmium selenide (CdSe). We compare the normalized birefringence for the material to that estimated by the Sellmeier-4 formula and to previously published measurements of a warm sample of sulfur-free CdSe. Finally, we measure the transmission as a function of wavelength

Academic Freedom and 21st Century European Universities

It is argued that university education has a moral and social function in society. Its purpose is to provide a liberal education (developing the intellect by challenging it to grapple freely with difficult ideas), the development of new knowledge and the provision of trustworthy, disinterested research. To serve society in this way safeguards are necessary: a separation from the state, giving institutional autonomy and academic freedom in teaching and research. With the rise of extreme free market capitalism and the &quot;knowledge society&quot;, these safeguards are being eroded: national governments, partly through the ramifications of the Bologna convergence process, are in the process of moulding universities to the needs of the market, and now see the accommodation of students to the workplace as the principal, or indeed only, objective for a university education. Example of the consequences of these changes are discussed, including the corruption of research integrity and erosion of individual liberties

G.A.T.S. and Universities: implications for research.

The likely impact of applying the General Agreement on Trade in Services (GATS) to higher education are examined. GATS aims to "open up" services to competition: no preference can be shown to national or government providers. The consequences for teaching are likely to be that private companies, with degree-awarding powers, would be eligible for the same subsidies as public providers. Appealing to the inadequate recently-introduced "benchmark" statements as proof of quality, they would provide a "bare bones" service at lower cost. Public subsidies would go: education being reduced that minimum which could be packaged in terms of verifiable "learning outcomes". The loss of "higher" aspirations, such education of critically-minded citizens of a democratic and civilised society would impoverish the university's research culture which demands honesty and openness to public scrutiny. Most university research is substantially supported by public subsidy. Under GATS discipline, commercial providers of research services could be entitled to similar public subsidies. Publicly funded fundamental research would fade, leaving university research totally dependent for funds upon the good will of industry and commerce. Present problems, such as the suppression of unwelcome results and the use of questionable results to manipulate public opinion, would considerably increase. The public would lose a prime source of trustworthy knowledge, needed in political discourse, legal disputation, consumer protection and in many other contexts