War as exit from exclusion?: the formation of Mayi-Mayi militias in Eastern Congo

In eastern Congo scores of young and marginalized people have been increasingly attracted to the mobilising efforts of new local actors. The inquiry into this phenomenon traces the emergence of the first militias to the end of the eighties. These first generation militias were a result of the growing willingness of marginalized youngsters and school drop-outs to form groups of under-aged combatants acting against eveiy representative of modern political authority and against their desperate feelings of exclusion, for which both their political and social environment were held responsible. As they had nothing more to lose than their marginalisation, rebellion became an option, both as a survival strategy and as a strategy of self-defence against a predatory political and social order. The shiftiness of their ideological basis and allies only further proved what these first militias were about: a search for alternatives to a situation of acute deprivation. This article reveals that the present RCD rebellion that rages through the eastern parts of the Democratic Republic of Congo has had an escalating effect on the proliferation of new militias. Before, the Kabila-led AFDL rebellion had already offered the already existing militias a new cause: that of an anti-Tutsi force fighting against foreign occupation. In resistance to the effects of state collapse and armed foreign interventions, rural and urban youth today have combined former traditions and newly developed patterns of mobility in an interpretation of customary and national defence. This has not meant that they link up with the traditional emanations of authority. Rather, a crisis in the social fabric has meant a shift in authority towards these combatants and the use of violence. In addition, shared feelings of antipathy towards the 'Tutsi-aggressors ' have facilitated the creation of links between these diverse local groupings and other, foreign, factions of armed militia roaming the local countryside. Consolidation, however, remains unlikely as this shared ideology does not run very deep and alliances continuously change. The question remains what the future impact of these militias might be on the local social order. On the one hand, for several years now in some remote areas these armed groupings have become the only representatives of any authority structure, even if this structure is based on violence. Contrary to other cases, these militias in South Kivu are still closely linked to the rural population and have not turned against them. On the other hand, the dynamic of the Inter-Congolese Dialogue has forced their leaders to present their grievances to the outside world

Photoemission investigation of the electronic structure of Fe-Pd and Fe-Pt alloys

A photoemission investigation of Fe-Pd and Fe-Pt transition-metal alloys, using ∼50–150-eV synchrotron radiation, is presented. We consider in particular the spectral distribution of Fe states when approaching the dilute limit. By means of the Cooper minimum in the 4d and 5d photoionization cross section, we identify structures that have mainly Fe minority- or Fe majority-spin character. The relative position of these peaks is discussed in terms of the covalent interaction between Fe 3d and Pd or Pt d states. Also, the strong resemblance between the distribution of Fe states in the Pd-based and in the Pt-based alloys is demonstrated. We find a consistent behavior of interacting d states towards the dilute limit. It is concluded that the Fe states that are observed in the photoemission spectra of the dilute alloys have mainly majority-spin character and are, because of the covalent interaction with host states, widely distributed over the energy range of the host d band. The Fe minority-spin band, which is centered near the Fermi level, gradually empties with increasing Fe dilution

ABRASIVE WEAR BY TiO 2 ON HARD AND LOW FRICTION COATINGS

ABSTRACT Several components in paint and plastic industry, like mixers, extrusion screws and dies, injection moulds, suffer heavily from abrasive wear. This wear is mainly induced by the presence of TiO 2 in the paint or in the plastic blend. Coating technology offers a solution to increase the wear resistance and consequently the lifetime of those components. The aim of this study is the evaluation of the micro-abrasive wear resistance of a range of commercially available hard and/or low friction coatings against rutile particles. Therefore, ball cratering tests EXPERIMENTAL SET-UP The tests were performed on a TE66 micro-scale abrasion tester manufactured by Plint. As abrasive suspensions, a typical rutile powder with small particle size (Ø 0.1-0.4 µm) and spherical grains in distilled water was used. Ball bearing steel was used as counterbody. The selected coatings ranged from hard ceramic coatings to softer low friction coatings. Four PVD coatings were used (TiN, CrN, TiCN and low temperature CrN), one CVD (TiN) and three PACVD (DLC and diamond-like nanocomposites Dylyn ® a-C:H/a-Si:O) TEST RESULTS AND EVALUATION The micro abrasion test resulted in a clear ranking of the selected coatings in function of the wear coefficient. In general, the hard ceramic coatings have the lowest wear coefficient. DLC and CrN performed very well. The softer coating types which are designed for reduction of the surface energy, such as NiP+PTFE, show an increase in wear of three orders of magnitude. However, there is no evidence for a close correlation between the wear rate and the coating hardness measured by depth sensing indentation. Only when the three very similar PACVD coatings are considered separately, the wear coefficient is significantly increasing with decreasing coating hardness. The results are obtained by using the extended Archard equation: with K c and K s are the wear coefficients of the coating and substrate respectively, V c and V s the measured wear volumes and SN the sliding distance multiplied by the applied load. Different ways of implementing equatio

Marine biogenics in sea spray aerosols interact with the mTOR signaling pathway

Sea spray aerosols (SSAs) have profound effects on our climate and ecosystems. They also contain microbiota and biogenic molecules which could affect human health. Yet the exposure and effects of SSAs on human health remain poorly studied. Here, we exposed human lung cancer cells to extracts of a natural sea spray aerosol collected at the seashore in Belgium, a laboratory-generated SSA, the marine algal toxin homoyessotoxin and a chemical inhibitor of the mammalian target of rapamycin (mTOR) pathway. We observed significant increased expression of genes related to the mTOR pathway and Proprotein convertase subtilisin/kexin type 9 (PCSK9) after exposure to homoyessotoxin and the laboratory-generated SSA. In contrast, we observed a significant decrease in gene expression in the mTOR pathway and of PCSK9 after exposure to the natural SSA and the mTOR inhibitor, suggesting induction of apoptosis. Our results indicate that marine biogenics in SSAs interact with PCSK9 and the mTOR pathway and can be used in new potential pharmaceutical applications. Overall, our results provide a substantial molecular evidence base for potential beneficial health effects at environmentally relevant concentrations of natural SSAs

The Lantern Vol. 13, No. 1, October 1944

• One Doctor\u27s Story • Sonnet for a Friend • Lines and a Sonnet • Chant • Circus Impressions • Spring Comes Latehttps://digitalcommons.ursinus.edu/lantern/1034/thumbnail.jp

The populations of planetary nebulae in the direction of the Galactic bulge

We have observed 44 planetary nebulae (PNe) in the direction of the Galactic bulge, and merged our data with published ones. We have distinguished, in the merged sample of 164 PNe, those PNe most likely to prtain physically to the Galactic bulge and those most likely to belong to the Galactic disk. We have determined the chemical composition of all the 164 objects in a coherent way. We looked for stellar emission features and discovered 14 new [WR] stars and 15 new weak emission line central stars. The analyzed data led us to the following conclusions: (1) The spectral type distribution of [WR] stars is very different in the bulge and in the disk of the Galaxy. However, the observed distributions are strongly dependent on selection effects. (2) The proportion of [WR] PNe is significantly larger in the bulge than in the disk. (3) The oxygen abundances in [WR] stars do no appear to be significantly affected by nucleosynthesis and mixing in the progenitors. (4) The O/H gradient of the Galactic disk PNe population flattens in the most internal parts of the Galaxy. (5) The median oxygen abundance in the bulge PN population is larger by 0.2 dex than in the disk population seen in the direction of the bulge. (6) Bulge PNe with smaller O/H tend to have smaller radial velocities. (7) The oxygen abundance distribution of bulge PNe is similar in shape to that of the metallicity distribution of bulge giants, but significantly narrower. (8) The location of SB 32 (PN G 349.7-09.1) in the (V_lsr, l_II) diagram and its low oxygen abundance argues that it probably belongs to the halo population.Comment: 14 pages, 16 figures. Accepted for publication in A&