Fabrication of Continuous Fire Wire Detection Sensor usingNegative Temperature Coefficient Material

Manganese-based spinel semiconducting ceramic was mixed with lanthanum oxide powderand the mixture was characterised for the reproducible negative temperature coefficient (NTC)of resistance behaviour. The same mixture was used for the fabrication of 15 m long continuousthermal detector.  The addition of La2O3 leads to decrease in thermistor constant and activationenergy values, thus giving freedom to fabricate thermal sensors for various temperatureapplications. A 3 m long continuous thermal detector for application in the temperature range275 - 350 oC was fabricated and later coupled to form a continuous unit of 15 m length

Localisation des parasites dans l'estomac du cheval de la région de Settat (Maroc)

L'examen de quatre-vingt-seize estomacs de chevaux originaires de la région de Settat (Maroc) a été réalisé d'octobre 1977 à septembre 1978. Chaque espèce parasitaire présente une niche particulière dans l'estomac. Ainsi Gasterophilus intestinalis est localisé essentiellement sur la muqueuse osophagienne de l'estomac et Gasterophilus nasalis sur la muqueuse pylorique Trichostrongylus axei est particulièrement rencontré sur la muqueuse fundique et Habronema spp. sur la muqueuse pylorique. En règle générale, les densités élevées d'un genre parasite provoquent une extension de sa niche écologique au contraire les densités élevées des autres genres concurrents imposent un retrait vers la niche habituell

Etude épidémiologique de certaines parasitoses du mouton au Maroc atlantique par utilisation de la méthode des "animaux traceurs"

Une étude qualitative et quantitative du profil parasitaire du mouton a été menée à la station zootechnique de la recherche agronomique d'El Koudia (région de Rabat). Trente agneaux sont utilisés comme révélateurs de parasitisme ("animaux traceurs"). De mai 1979 à mai 1980, 2 ou 3 agneaux par mois sont introduits dans le troupeau évoluant sur pâturage. Ils y restent de 30 à 45 jours puis sont retirés et gardés en bergerie 4 semaines avant d'être sacrifiés. Tous les parasites internes (helminthes et ostres) sont récoltés, comptés et identifiés. Sont rencontrés: - dans la caillette: Ostertagia spp., Trichostrongylus axei et Haemonchus contortus, - dans l'intestin grêle: Moniezia benedeni, Moniezia expansa, Nematodirus spp., Trichostrongylus spp., Bunostomum trigonocephalum, - dans le gros intestin: Oesophagostomum venulosum, Trichuris spp., - et dans les cavités nasales et les sinus: Oestrus ovis. L'incidence saisonnière des parasites de la caillette montre un maximum d'infestation en hiver et au printemps et une absence de parasites en été; les trichostrongylidés parasites de l'intestin grêle suivent grossièrement la même évolution. La détermination du poids et du nombre de Moniezia spp. fait ressortir une monieziose en hiver et au printemps. Le gros intestin s'avère peu parasité. Enfin l'hiver seul semble être une saison défavorable à l'infestation par Oestrus ovi

Short-period variable stars in young open cluster Stock 8

We present time-series photometry in the field of Stock 8 and identified 130 short-period variable stars. Twenty-eight main-sequence and 23 pre-main-sequence variables are found to be part of cluster Stock 8. The main-sequence variables are classified as slow pulsators of the B-type, β Cep, and δ Scuti stars. Fourteen main-sequence stars could be new class variables as discussed by Mowlavi et al. and Lata et al. The age and mass of pre-main-sequence variables are found to be lesssim5 Myr and in the mass range of 0.5–2.8 M ⊙, respectively. These pre-main-sequence stars could be T-Tauri variables. We have found 5 and 2 of 23 pre-main-sequence variables as classical T-Tauri stars and Herbig Ae/Be stars, respectively, whereas 16 pre-main-sequence stars are classified as weak-line T-Tauri stars

Stabilin receptors clear LPS and control systemic inflammation

Lipopolysaccharides (LPSs) cause lethal endotoxemia if not rapidly cleared from blood circulation. Liver sinusoidal endothelial cells (LSEC) systemically clear LPS by unknown mechanisms. We discovered that LPS clearance through LSEC involves endocytosis and lysosomal inactivation via Stabilin-1 and 2 (Stab1 and Stab2) but does not involve TLR4. Cytokine production was inversely related to clearance/endocytosis of LPS by LSEC. When exposed to LPS, Stabilin double knockout mice (Stab DK) and Stab1 KO, but not Stab2 KO, showed significantly enhanced systemic inflammatory cytokine production and early death compared with WT mice. Stab1 KO is not significantly different from Stab DK in circulatory LPS clearance, LPS uptake and endocytosis by LSEC, and cytokine production. These data indicate that (1) Stab1 receptor primarily facilitates the proactive clearance of LPS and limits TLR4-mediated inflammation and (2) TLR4 and Stab1 are functionally opposing LPS receptors. These findings suggest that endotoxemia can be controlled by optimizing LPS clearance by Stab1

Damping mechanisms for oscillations in solar prominences

Small amplitude oscillations are a commonly observed feature in prominences/filaments. These oscillations appear to be of local nature, are associated to the fine structure of prominence plasmas, and simultaneous flows and counterflows are also present. The existing observational evidence reveals that small amplitude oscillations, after excited, are damped in short spatial and temporal scales by some as yet not well determined physical mechanism(s). Commonly, these oscillations have been interpreted in terms of linear magnetohydrodynamic (MHD) waves, and this paper reviews the theoretical damping mechanisms that have been recently put forward in order to explain the observed attenuation scales. These mechanisms include thermal effects, through non-adiabatic processes, mass flows, resonant damping in non-uniform media, and partial ionization effects. The relevance of each mechanism is assessed by comparing the spatial and time scales produced by each of them with those obtained from observations. Also, the application of the latest theoretical results to perform prominence seismology is discussed, aiming to determine physical parameters in prominence plasmas that are difficult to measure by direct means.Comment: 36 pages, 16 figures, Space Science Reviews (accepted

India’s contribution to mitigating the impacts of climate change through vegetation management

The changes in natural ecosystems provide opportunity to increase vegetation carbon sink capacity and thereby contribute to mitigation of climate change impacts. The Indian tropics and the large ecological variation within the country afford the advantage of diverse niches and offer opportunities to reveal the role of biotic factors at different levels of organization from populations to ecosystems. The last 4 decades of research and development in the Indian space science community has been primarily application driven in response to the government space programme for national development. The expenditure in R&D over next 5 year suggest that scientific research is higher on the country's agenda. The Indo-UK Terrestrial Carbon Group (IUTCG) comprising both Indian and UK scientists, funded jointly by the Department of Science and Technology, India and the Department of Business, Innovation and Skills organised a workshop to explore ways in which Earth observation data can be effectively utilised in mitigating the impacts of climate change through vegetation management. Effective integration of field observations, collected through various monitoring networks, and satellite sensor data has been proposed to provide country-wide monitoring

Kaon Production and Kaon to Pion Ratio in Au+Au Collisions at \snn=130 GeV

Mid-rapidity transverse mass spectra and multiplicity densities of charged and neutral kaons are reported for Au+Au collisions at \snn=130 GeV at RHIC. The spectra are exponential in transverse mass, with an inverse slope of about 280 MeV in central collisions. The multiplicity densities for these particles scale with the negative hadron pseudo-rapidity density. The charged kaon to pion ratios are $K^+/\pi^- = 0.161 \pm 0.002 {\rm (stat)} \pm 0.024 {\rm (syst)}$ and $K^-/\pi^- = 0.146 \pm 0.002 {\rm (stat)} \pm 0.022 {\rm (syst)}$ for the most central collisions. The $K^+/\pi^-$ ratio is lower than the same ratio observed at the SPS while the $K^-/\pi^-$ is higher than the SPS result. Both ratios are enhanced by about 50% relative to p+p and $\bar{\rm p}$+p collision data at similar energies.Comment: 6 pages, 3 figures, 1 tabl