110 research outputs found
Five years of Ulysses dust data: 2000-2004
No full textKrueger H, Altobelli N, Anweiler B, et al. Five years of Ulysses dust data: 2000-2004. Planetary and Space Science. 2006;54(9-10):932-956.The Ulysses spacecraft has been orbiting the Sun on a highly inclined ellipse (i = 79 degrees, perihelion distance 1.3 AU, aphelion distance 5.4 AU) since it encountered Jupiter in 1992. Between January 2000 and December 2004, the spacecraft completed almost an entire revolution about the Sun, passing through perihelion in May 2001 and aphelion in July 2004. In this five-year period the dust detector on board recorded 4415 dust impacts. We publish and analyse the complete data set of both raw and reduced data for particles with masses 10(-16) g <= M <= 10(-7) g. Together with. 1695 dust impacts recorded between launch of Ulysses and the end of 1999 published earlier (Grain, E., Baguhl, M., Divine, N., Fechtig, H., Hamilton, D.P, Harmer, M.S., Kissel, J., Lindblad, B.A., Linkert, D., Linkert, G., Mann, L, McDonnell, J.A.M., Morfill, G.E., Polanskey, C., Riemann, R., Schwehm, G.H., Siddique, N., Staubach, P., Zook, H.A., 1995a. Two years of Ulysses dust data. Planetary Space Sci. 43, 971-999, Paper III; Kruger, H., Grun, E., Landgraf, M., Baguhl, M., Dermott, S.F., Fechtig, H., Gustafson, B.A., Hamilton, D.P., Harmer, M.S., Horanyi, M., Kissel, J., Lindblad, B., Linkert, D., Linkert, G., Mann, L, McDonnell, J.A.M., Morfill, G.E., Polanskey, C., Schwehm, G.H., Srama, R., Zook, H.A., 1995. Three years of Ulysses dust data: 1993 to 1995. Planetary and Space Sci. 47, 363-383, Paper V; Kruger, H., Grun, E., Landgraf, M., Dermott, S.F., Fechtig, H., Gustafson, B.A., Hamilton, D.P., Harmer, M.S., Horanyi, M., Kissel, J., Lindblad, B., Linkert, D., Linkert, G., Mann, I., McDonnell, J.A.M., Morfill, G.E., Polanskey, C., Schwehm, G.H., Srama, R., Zook, H.A., 2001b. Four years of Ulysses dust data: 1996 to 1999. Planetary Space Sci. 49, 1303-1324, Paper VII), a data set of 6110 dust impacts detected with the Ulysses sensor between October 1990 and December 2004 is now available. The impact rate measured between 2000 and 2002 was relatively constant with about 0.3 impacts per day showing a maximum at 1.5 per day around ecliptic plane crossing in early-2001. The impact direction of the majority of impacts between 2000 and 2002 is compatible with particles of interstellar origin, the rest are most likely interplanetary particles. In 2003 and 2004 dust stream particles originating from the jovian system dominated the overall impact rate. Twenty-two individual dust streams were measured between November 2002 and December 2004. The observed impact rates are compared with models for interplanetary and interstellar dust. The dust measurements from the entire mission since Ulysses launch give good agreement with the interplanetary flux model of Staubach, P., Grun, E., Jehn, R., 1997. The meteoroid environment near Earth, Adv. Space Res. 19, 301-308. (c) 2006 Elsevier Ltd. All rights reserved
λ-Orthogonale Photochemie: Lichtinduzierte pericyclische Reaktionen an Makromolekülen
No full textEine photochemische Strategie nutzt λ-orthogonale Reaktionen zum Aufbau makromolekularer Architekturen und zum wellenlängenabhängigen Einbau chemischer Funktionalitäten in ein einzelnes Molekül. λ-Orthogonale pericyclische Reaktionen können unabhängig voneinander durch die spezifische photochemische Aktivierung einer chemischen Funktionalität ablaufen. Die Leistungsfähigkeit dieses neuen Konzeptes wird durch eine Eintopfreaktion belegt, bei der Maleinsäureimid mit zwei Polymeren, die unterschiedliche photoaktive Endgruppen (Photoenol und Tetrazol) tragen, selektiv reagieren. Beliebige aktivierte Doppelbindungen können durch eine gezielte Bestrahlung mit λ=310–350 nm mit einem Photoenol-funktionalisierten Polymer reagieren. Nach vollständigem Photoenolumsatz aktiviert eine Bestrahlung mit λ=270–310 nm die Reaktion des Tetrazols mit Maleimid. Die Vielseitigkeit dieses Ansatzes wird durch die λ-orthogonale Klick-Reaktionen von komplexen Maleimiden, funktionalen Enen und Polymeren an ein zentrales Polymergerüst gezeigt
Spatially controlled surface immobilization of nonmodified peptides
No full textA phencyclone derivative is used to achieve light-controlled immobilization of peptides possessing only natural amino acids. The photoactive precursor (blue in picture) is formed in a Diels-Alder reaction and can undergo light-triggered ring-opening reactions with amines. Successful surface patterning with a genuine c(RGDfK) peptide (green) is evidenced by imaging time-of-flight secondary-ion mass spectrometry (ToF-SIMS). Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Registration of ‘Linkert’ Spring Wheat with Good Straw Strength and Adult Plant Resistance to the Ug99 Family of Stem Rust Races
No full textGalileo long-term dust monitoring in the Jovian magnetosphere
No full textThe Galileo spacecraft was launched in 1989, and—between 1995 and 2003—was the first spacecraft in orbit about Jupiter. The in-situ dust instrument on board was a highly sensitive impact-ionisation dust detector which measured the speed, mass and impact direction of dust particles hitting a metal target. It provided a unique 12-year record of cosmic dust in interplanetary and circumjovian space. Degradation of the instrument electronics caused by the harsh radiation environment in the inner jovian magnetosphere was recognised in various ways: the sensitivity for dust detection dropped by a factor of 7.5 between 1996 and 2003 while the noise sensitivity decreased by up to a factor of 100. Shifts in the parameters measured during dust impacts and noise events (charge amplitudes and signal rise times, etc.) required a time-dependent algorithm for noise identification. After noise removal a total of 21 224 complete data sets for dust impacts (i.e. impact charges, signal rise times, impact direction, etc.) is available from the entire Galileo mission between 1989 and 2003 (18 340 data sets from the Jupiter mission after 1996). This homogeneous data set has been used in many investigations of jovian dust published already or ongoing. Electronics degradation prevents the application of the mass and speed calibration to data obtained after 2000. Only in cases where the impact speed of grains is known by other means can grain masses be derived for later measurements. The drop of the detection sensitivity also required a time-dependent correction for fluxes of jovian dust streams, reaching a factor of 20 in 2002. We use the derived homogeneous noise-removed data set for long-term monitoring of the jovian dust streams with Galileo. The derived fluxes of dust stream particles were highly variable by about five orders of magnitude, between 3×10-3 and and exhibited strong orbit-to-orbit variability. This extensive and valuable data set is available for further detailed investigations
Pengukuran Quality Of Service And Facilities terhadap Customer Satisfaction
No full textCollege library is a library that aims to meet the information needs of teachers and students at the college concerned (Indonesian National Standard Draft) and then refined into a library that aims to meet the information needs of teachers and students at universities and can also be open to the public (Fatmawati, 2013). This research was conducted by distributing questionnaires to 60 respondents using the probability sampling method to library visitors by giving scores using a Linkert scale to determine user satisfaction with the services and facilities provided. This study uses PLS (Partial Least Square) analysis to test the hypothesis. The results of this study indicate (1) the quality of service in the library has a positive but insignificant effect on user satisfaction. (2) facilities in the library have a positive and significant effect on library customer satisfaction.Perpustakaan perguruan tinggi merupakan perpustakaan yang bertujuan memenuhi kebutuhan informasi pengajar dan mahasiswa di perguruan tinggi yang bersangkutan (Rancangan Standar Nasional Indonesia) dan kemudian disempurnakan menjadi perpustakaan yang bertujuan memenuhi kebutuhan informasi pengajar dan mahasiswa di perguruan tinggi dan dapat juga terbuka untuk public (Fatmawati, 2013). Penelitian ini dilaksanakan dengan melakukan sebar kuisioner pada 60 responden dengan metode probability sampling pada pengunjung perpustakan dengan pemberian skor dengan menggunakan skala Linkert guna mengetahui kepuasan pengguana atas pelayanan dan fasilitas yang diberikan. Penelitian ini menggunakan analisis PLS (Partial Least Square) untuk menguji hipotesis. Hasil penelitian ini menunjukkan (1) kualitas pelayanan di perpustakaan berpengaruh positif namun tidak signifikan terhadap kepuasan pelanggan perpustakaan. (2) fasilitas di perpustakaan berpengaruh positif dan signifikan terhadap kepuasan pengunjung perpustakaan
Ambient temperature ligation of diene functional polymer and peptide strands onto cellulose via photochemical and thermal protocols
No full textIn the present contribution, two novel ambient temperature avenues are introduced to functionalize solid cellulose substrates in a modular fashion with synthetic polymer strands (poly(trifluoro ethyl methacrylate), PTFEMA, M n = 4400 g mol-1, D = 1.18) and an Arg-Gly-Asp (RGD) containing peptide sequence. Both protocols rely on a hetero Diels-Alder reaction between an activated thiocarbonyl functionality and a diene species. In the first - thermally activated - protocol, the cellulose features surface-expressed thiocarbonylthio compounds, which readily react with diene terminal macromolecules at ambient temperature. In the second protocol, the reactive ene species are photochemically generated based on a phenacyl sulfide-decorated cellulose surface, which upon irradiation expresses highly reactive thioaldehyde species. The generated functional hybrid surfaces are characterized in-depth via ToF-SIMS and XPS analysis, revealing the successful covalent attachment of the grafted materials, including the spatially resolved patterning of both synthetic polymers and peptide strands using the photochemical protocol. The study thus provides a versatile platform technology for solid cellulose substrate modification via efficient thermal and photochemical ligation strategies. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Pengaruh Social Media Marketing Terhadap Minat Berkunjung Event We The Fest.
No full textPenelitian ini bertujuan untuk menjelaskan dan menganalisis pengaruh social media marketing yang digunaka we the fest terhadap minat berkunjung. Penelitian ini menggunakan jenis kuantitatif. Teknik pengambilan sampel yang digunakan adalah aplikasi G*Power versi 3.1. metode pengumpulan data mengunakan kuesioner dengan skala model Linkert yang mengukur varibel independent (social media marketing) dan variable dependen (minat berkunjung). Sampel yang digunakan berjumlah 120 responden yang merupakan followers Instagram @wethefest. Untuk menguji analisis, penelitian ini menggunakan SPSS Statistics version 26.0. Anaisis data yang digunakan adalah analisis deskriftif dengan. Metode regresi linear sederhana. Hasil dari penelitian ini menunjukan bahwa social media marketing berpengaruh secara prositif dan signifikan terhadap minat berkunjug pada event we the fest
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