A Far-Ultraviolet Spectroscopic Survey of Low-Redshift AGN

Using the Far Ultraviolet Spectroscopic Explorer (FUSE) we have obtained 87 spectra of 57 low-redshift (z<0.15) active galactic nuclei (AGN). This sample comprises 53 Type 1 AGN and 4 Type 2. All the Type 1 objects show broad O VI 1034 emission; two of the Type 2s show narrow O VI emission. In addition to O VI, we also identify emission lines due to C III 977, N III 991, S IV 1062,1072, and He II 1085 in many of the Type-1 AGN. Of the Type 1 objects, 30 show intrinsic absorption by the O VI 1032,1038 doublet. Most of these intrinsic absorption systems show multiple components with intrinsic widths of 100 km/s spread over a blue-shifted velocity range of less than 1000 km/s. Galaxies in our sample with existing X-ray or longer wavelength UV observations also show C IV absorption and evidence of a soft X-ray warm absorber. In some cases, a UV absorption component has physical properties similar to the X-ray absorbing gas, but in others there is no clear physical correspondence between the UV and X-ray absorbing components. Models in which a thermally driven wind evaporates material from the obscuring torus naturally produce such inhomogeneous flows.Comment: Contributed paper to appear in the proceedings of the Guillermo Haro 2003 Conference on Multiwavelength AGN Surveys; 3 pages, 1 figur

Stellungnahme zur Straßenbindung Rhein-Main–Erfurt, Abschnitt Fulda-Meiningen

Die rechtlich anerkannten Naturschutzverbände der AGN sind gegen eine überregionale Straße, die den Naturraum Rhön und seine Menschen dauerhaft irreparabel ökologisch wie wirtschaftlich schädigt. Durch die überregionale Straße wird umfangreicher Transitverkehr erzeugt ohne eine Wertschöpfung für die Region zu schaffen. Eine neue Bundesfernstraßenverbindung durch die Hochrhön ist mit den Belangen des Naturschutzes, des Tourismus und einer nachhaltigen Landbewirtschaftung unvereinbar. Eine massive Verletzung der Einmaligkeit der Rhön – und eine unqualifizierte zentrale Verbindung könnte zu einer solchen Verletzung führen – darf nur unter schonender Streckenführung und unter guter glaubhafter Begründung und nicht aus kurzfristig wirtschaftlichem oder politischem Interesse stattfinden. Aufgabe der Politik ist es, das Biosphärenreservat Rhön in seinem Bestand für die Zukunft ökonomisch und ökologisch sicher zu machen und den Menschen ihre Heimat auf Dauer lebenswert zu erhalten

Key Science Observations of AGNs with KaVA Array

KaVA (KVN and VERA Array) is a new combined VLBI array with KVN (Korean VLBI Network) and VERA (VLBI Exploration of Radio Astrometry). First, we briefly review the imaging capabilities of KaVA array which actually achieves more than three times better dynamic range than that achieved by VERA alone. The KaVA images clearly show detailed structures of extended radio jets in AGNs. Next, we represent the key science program to be led by KaVA AGN sub working group. We will conduct the monitoring observations of Sgr A* and M87 because of the largeness of their central super-massive black hole angular sizes. The main science goals of the program are (i) testing magnetically-driven-jet paradigm by mapping velocity fields of the M87 jet, and (ii) obtaining tight constraints on physical properties of radio emitting region in Sgr A*.Comment: Proceedings of the 12th European VLBI Network Symposium and Users Meeting, 7-10 October 2014, Cagliari, Ital

ANALISIS KESALAHAN SISWA SMA NEGERI SE-BANJARMASIN UTARA DALAM MENYELESAIKAN SOAL PROGRAM LINEAR BERDASARKAN KRITERIA WATSON

Salah satu materi matematika yang dianggap sulit adalah materi program linear dan siswa sering melakukan berbagai kesalahan dalam menyelesaikan persoalannya. Materi ini mempunyai peranan yang sangat penting, karena memuat permasalahan-permasalahan kontekstual yang sesuai dengan kehidupan sehari-hari. Penelitian ini bertujuan untuk menganalisis jenis kesalahan yang dilakukan siswa dalam menyelesaikan soal yang berkaitan dengan program linear berdasarkan kriteria Watson. Penelitian ini menggunakan metode penelitian deskriptif dengan populasi seluruh siswa kelas XI MIPA SMA Negeri Se-Kecamatan Banjarmasin Utara. Pengumpulan sampel dilakukan menggunakan teknik purposive sampling&nbsp; dan simple random sampling dengan sampel penelitian kelas XI MIPA 1, XI MIPA 4, dan XI MIPA 5 pada SMA Negeri 5 Banjarmasin, kelas XI MIPA 1 dan XI MIPA 3 pada SMA Negeri 11 Banjarmasin, serta kelas XI MIPA 1 dan XI MIPA 2 pada SMA Negeri 12 Banjarmasin. Teknik pengumpulan data dilakukan menggunakan tes soal uraian dan dianalisis berdasarkan kriteria Watson. Hasil penelitian menunjukkan jenis kesalahan kategori kecil terjadi pada kesalahan “data hilang”, “kesimpulan hilang”, “prosedur tidak tepat”, dan “masalah hierarki keterampilan”, sedangkan kategori sangat kecil terjadi pada kesalahan “konflik level respon”, “selain ketujuh kategori”, “manipulasi tidak langsung”, dan “data tidak tepat”

A study of the distribution and diversity of the Family Orchidaceae on some selected lava flows of Mount Cameroon

A survey was conducted between December 2005 and November 2006 to determine the diversity and distribution of the family Orchidaceae on three lava flows on Mount Cameroon and to relate species diversity and abundance to altitude, age and soil types. Thirty plots, each of 10 × 10 m were surveyed at low, mid and high altitudes on each lava flow. Forty nine orchid species belonging to 14 genera were identified, with the genera Bulbophyllum and Polystachya being the most represented. One unidentified species was encountered. A rare species, Vanilla sp, was identified in situ. Bulbophyllum porphyrostachys was the most abundant species and grew on the 1959 and 1999 aa lava flows. The least represented species were Ansellia africana and Diphananthe bueae. Diversity and distribution of the orchids depended on altitude, age and climate types of the various lava flows. Diversity was in the order 1922> 1999> 1959. Soil analyses revealed that important chemical parameters change with age and altitude of lava flows. These changes result in changes in diversity. Principal component analyses carried out to determine the orchid safe sites showed that, for any orchid establishment, their ecology, altitude and their association with lower plants (ferns mosses and lichens) are of vital importance

Weed management in banana production: The use of Nelsonia canescens (Lam.) Spreng as a nonleguminous cover crop

During a survey of weeds in the Tiko banana plantations, the plant Nelsonia canescens (Lam.) Spreng was found to have invaded large areas of the plantation with no visible adverse effects on the banana crop. The effects of this Acanthaceae on banana yield parameters, snails’ population and weed species diversity and abundance were evaluated, with the intension of recommending the plant as a cover crop in weed management in banana plantations. Of the 73 weed species identified in Tiko banana plantation, only nine were found growing in association with N. canescens. These weed species also showed reduced abundance and vigour. The reduction in abundance ranged from 60 to 100%. The reduction in abundance was more pronounced during the dry season when cover crop growth was dense, than in the rainy season when there was reduced growth. The pseudo - stem circumference, bunch weight and hand class were significantly higher (p > /0.05) for plants grown with cover crop than for those grown without. The number of snails on and around the pseudo - stem was also significantly reduced in banana grown with N. canescens cover crop than in plants grown without. N. canescens has an added advantage in that it is prostrate and does not climb on the banana pseudo - stem. This may be a good alternative weed management tool in banana production. The techniques of mass production need to be developed