6,733 research outputs found
Collective narratives and politics in the contemporary study of work : the new management practices debate
In this article we explore the question of how as sociologists of work we might research those who constitute the substance of our labour process. We approach this question through an examination of the New Management Practices debate, principally in the labour movement where a distinctive and critical view of NMP developed in the late 1980s. Second, we argue that there is a link between this debate and the wider politics of labour process discussion both within and beyond the labour movement which has witnessed a shift away from an earlier engagement with worker interventions. In response we suggest the need to re-evaluate the nature of academic engagement with labour thus reanimating a closer engagement with labour-in-work and collective worker narratives
Pion Scattering Revisited
Chiral Ward identities lead to consistent accounting for the sigma's width in
the linear sigma model's Feynman rules. Reanalysis of pion scattering data at
threshold imply a mass for the sigma of 600+ 200 - 100 MeV.Comment: latex; VIII EMPC (Oaxaca, Nov 98) Proceeding
Masses and widths of the rho(770)
Isospin violation in the mass and width is considered within the
matrix approach using combined fits to the and
data performed by the ALEPH collaboration. We
show that the pole position following from the parameters obtained from the
ALEPH fits are not sensitive to the details of the parametrization. In this
context, we have found that the pole mass difference and the pole width
difference between the charged and neutral are consistent with zero. We
show that a one loop calculation including vector, axial vector and
pseudo-scalar mesons can satisfactorily describe the observed isospin breaking.
We also give an estimate for the mass difference between the neutral and
charged states of the .Comment: 8 pages, 1 figur
ABIOTIC DEGRADATION OF IODOSULFURON-METHYL-ESTER IN AQUEOUS SOLUTION
The abiotic degradation of iodosulfuron-methyl-ester was investigated under both alkaline and acidic
pH conditions in the dark, and results showed it to be a rather stable molecule in neutral or slightly
alkaline environments. Photochemical reactions were studied using a high-pressure mercury arc lamp,
and results showed that direct phototransformation is possible under normal environmental conditions
(ĂŹ > 290 nm). High-performance liquid chromatography (HPLC-UV and HPLC-MS) analyses were
used to identify the degradates and to study the kinetics of photodecomposition and hydrolysis. Five
main products of iodosulfuron-methyl-ester degradation were tentatively identified, and one of them
(4-methoxy-6-methyl-1,3,5-triazin-2-amine) was confirmed using an authentic standard. Among the
phototransformation mechanisms, photosubstitution of the iodide atom by a hydroxyl group,
photodissociation of the N-S bond, and photoassisted hydrolysis were observed. The quantum
efficiencies (multiwavelength quantum yield) of the photodegradation under different conditions were
determined, and values of 0.054 ( 0.02 (pH 9.6), 0.08 ( 0.02 (pH 7), and 0.044 ( 0.008 (pH 5.3)
were obtained
TOXICITY OF PREDNISOLONE, DEXAMETHASONE AND THEIR PHOTOCHEMICAL DERIVATIVES ON AQUATIC ORGANISMS
Light exposure of aqueous suspensions of prednisolone and dexamethasone causes their partial phototransformation.
The photoproducts, isolated by chromatographic techniques, have been identified by spectroscopic means.
Prednisolone, dexamethasone and their photoproducts have been tested to evaluate their acute and chronic toxic effects
on some freshwater chain organisms. The rotifer Brachionus calyciflorus and the crustaceans Thamnocephalus platyurus
and Daphnia magna were chosen to perform acute toxicity tests, while the alga Pseudokircheneriella subcapitata (formerly
known as Selenastrum capricornutum) and the crustacean Ceriodaphnia dubia to perform chronic tests. The
photochemical derivatives are more toxic than the parent compounds. Generally low acute toxicity was found. Chronic
exposure to this class of pharmaceuticals caused inhibition of growth population on the freshwater crustacean C. dubia
while the alga P. subcapitata seems to be less affected by the presence of these drugs
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