15,115 research outputs found

    The environmental significance of the Indigenous estate: Natural resource management as economic development in remote Australia

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    This discussion paper explores the geography of the Indigenous estate, its environmental significance, and some of the innovative approaches adopted by Indigenous landholders to protect the natural and cultural values of their land. A number of maps are used to explore the environmental significance of the Indigenous estate. These maps indicate that the Indigenous estate—making up 20 per cent of the Australian land mass—covers vast areas of relatively intact land. The Indigenous estate contains some of the highest conservation priority lands in Australia. Emerging recognition of the environmental significance of the Indigenous estate is indicated by a number of Commonwealth-funded programs that represent a form of payment for environmental services (PES). Such programs provide important employment opportunities for Indigenous people living in some of the remotest parts of Australia, areas far from mainstream labour markets. Environmental service provision might provide alternate development opportunities on the Indigenous estate beyond standard private sector industries like mining, tourism and pastoralism, or publicly-funded provision of standard municipal services

    Fishes of the Red River in Arkansas

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    Fishes were collected from Red River mainstem habitats in Arkansas with seines, rotenone, hoop nets, gill nets, and trotlines from 1995 through 2001. Seventy-two species were identified distributed among 17 families, and 15 species were new records for the Red River in Arkansas. Eighty-three species are now historically known from the Arkansas segment of the Red River. Approximately 67% of the fishes known from the entire Red River have been found in the Arkansas segment, which is only 11% of the entire river length. Baseline data on the fish fauna of the Red River is critical for the analysis of potential effects to aquatic systems, and because of the potential for deleterious effects from alteration of aquatic habitats by a proposed project to extend the Red River Navigation System upstream from Shreveport, Louisiana to Index, Arkansas and by desalination projects upstream in Texas

    WFPC2 LRF Imaging of Emission Line Nebulae in 3CR Radio Galaxies

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    We present HST/WFPC2 Linear Ramp Filter images of high surface brightness emission lines (either [OII], [OIII], or H-alpha+[NII]) in 80 3CR radio sources. We overlay the emission line images on high resolution VLA radio images (eight of which are new reductions of archival data) in order to examine the spatial relationship between the optical and radio emission. We confirm that the radio and optical emission line structures are consistent with weak alignment at low redshift (z < 0.6) except in the Compact Steep Spectrum (CSS) radio galaxies where both the radio source and the emission line nebulae are on galactic scales and strong alignment is seen at all redshifts. There are weak trends for the aligned emission line nebulae to be more luminous, and for the emission line nebula size to increase with redshift and/or radio power. The combination of these results suggests that there is a limited but real capacity for the radio source to influence the properties of the emission line nebulae at these low redshifts (z < 0.6). Our results are consistent with previous suggestions that both mechanical and radiant energy are responsible for generating alignment between the radio source and emission line gas.Comment: 80 pages, 54 figures. Accepted for publication in ApJ

    Testing the ΔS=ΔQ\Delta S=\Delta Q Rule with Exclusive Semi-Leptonic Kaon Decays

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    We consider the possibility of violations of the selection rule ΔS=ΔQ\Delta S=\Delta Q at an appreciable level in {\it exclusive} semi-leptonic decays of Kaons. At Φ\Phi-Factories, intense Kaon beams will be available and will probe among others, the semi-leptonic decays Kl4K_{l4} and Kl3γK_{l3\gamma} in addition to Kl3K_{l3} and could provide novel testing grounds for the ΔS=ΔQ\Delta S=\Delta Q rule. In particular, the branching ratio of Kl3γK_{l3\gamma} is non-negligible and could be used to probe new phenomena associated with the violation of this selection rule. Furthermore, we modify certain di-lepton event rate ratios and asymmetries and time asymmetries that have been constructed by Dass and Sarma for di-lepton events from Beon decays to test the ΔB=ΔQ\Delta B=\Delta Q at the Υ(4S)\Upsilon (4S), to the Kaon system at the ϕ(1020)\phi(1020). We find that the large width of the KSK_S relative to that of KLK_L plays an important role in enhancing some of the time asymmetries.Comment: 10 pages, Plain Latex, To be run twice

    Analysis of a new genetic cross between two East African Trypanosoma brucei clones

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    Two clones of East African Trypanosoma brucei, with distinct homozygous isoenzyme patterns for one of three enzymes examined, were cotransmitted through the tsetse fly vector Glossina morsitans centralis. Flies with mature infections were individually fed on mice and the subsequent bloodstream form populations analysed for the presence of hybrid trypanosomes by isoenzyme analysis. Several combinations have previously been detected using this approach (Schweizer, Tait & Jenni, 1988; Sternberg et al. 1989). Four clones were isolated from one of the hybrid-containing populations. They showed a hybrid phenotype, as would be expected for the F1 progeny in a diploid Mendelian system. The analysis of the progeny clones, using two gene probes which detect restriction fragment length polymorphisms between the two parental stocks, showed that alleles had segregated at each locus and given rise to three different non-parental combinations of alleles in the hybrid progeny. Characterization of the hybrid progeny clones by PFGE (pulsed field gradient gel electrophoresis) revealed that all progeny clones were recombinant for the intermediate size chromosomes. From the analysis of the segregation of the larger chromosomes, marked by P0K (phosphoglycerate kinase) and CP (cysteine protease) gene probes, it was inferred that the progeny clones did not result from a direct fusion of diploid cells. Results with the PGK probe fit into a classical system with meiosis and subsequent fusion of the nuclei to form diploid progeny. On the other hand, blots with the CP probe as well as some of the ethidium bromide stained PFGE gels revealed the existence of non-parental size chromosomes in some of the hybrid progeny. This phenomenon was observed previously (Gibson, 1989) and further investigation is required to elucidate the mechanis

    Inverse Scattering for Gratings and Wave Guides

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    We consider the problem of unique identification of dielectric coefficients for gratings and sound speeds for wave guides from scattering data. We prove that the "propagating modes" given for all frequencies uniquely determine these coefficients. The gratings may contain conductors as well as dielectrics and the boundaries of the conductors are also determined by the propagating modes.Comment: 12 page
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