A fossil byblidaceae seed from eocene South Australia

Copyright © 2004 by The University of ChicagoA single mummified angiosperm seed is described from a middle Eocene clay lens deposit at the Monier East Yatala Sand Pit, Golden Grove, South Australia. The seed is small (0.7 mm long and 0.45 mm wide), elliptical, black, and shows complex raised reticulate honeycomb sculpturing with deeply excavated cell floors and verrucate sculpturing on the anticlinal ridges. The fossil was compared against extant species of Byblis and the Droseraceae, especially the Drosera indica L. complex, common annual carnivorous plants that grow in seasonally damp environments in northern Australia and that have similarly small sculptured seeds. The combination of deep reticulately honeycombed cells and the verrucate anticlinal walls places the seed close to extant taxa in the Byblis liniflora Salisb. complex. However, in the absence of a larger sample and/or of definitive features to assign the fossil unequivocally to an extant species, as well as nomenclatural restrictions preventing the typification of a fossil by an illustration, the specimen is described as a parataxon and placed in Byblidaceae but without a formal name.Conran, John G., and David C. Christophe

Leveling the Playing Field: Disability, Title IX, and High School Sports

The Americans with Disabilities Act requires that covered entities provide a substantially equivalent experience to that of able-bodied persons. However, the Seventh Circuit, recently applied a but for test for a para-ambulatory high school athlete’s reasonable accommodation request, and denied this request. This Note argues that the Seventh Circuit should have used a two-part meaningful access test, which should be informed by past legislation based on discrimination as a result of physiological differences. To ensure that para-ambulatory student athletes have the opportunity to participate in high school sports, a separate division or qualifying times must be created

The Importance of Usability for Learning with Digital Media

Im Rahmen einer quantitativen Feldstudie wurde der Zusammenhang zwischen der System Usability eines digitalen Lernmediums und dem erzielten Lernerfolg in einem computerbasierten Unterrichtssetting untersucht. 31 Schülerinnen und Schüler zweier gymnasialer Biologie-Leistungskurse absolvierten dazu eine webbasierte Lerneinheit zu einem Thema der Zellbiologie. Es zeigte sich eine mittlere Korrelation zwischen der Usabilitybewertung und dem Ergebnis eines Leistungstests (r(28) = .384, p < .05). Der Zusammenhang erwies sich auch unter Kontrolle lernerfolgsrelevanter Personenmerkmale mittels multipler Regression als stabil. Gemeinsam erklären Vorwissen, numerische Verarbeitungskapazität, Aktualmotivation und System Usability 52.9% der beobachteten Leistungstestvarianz. Ferner zeigte sich ebenso eine mittlere Korrelation zwischen System Usability und dem Interesse der Schüler an der Lernaufgabe (r(28) = .396, p < .05). Usability erscheint damit als bedeutsames Interaktionsmerkmal für das Lernen mit digitalen Medien. In der durchgeführten Studie erklärte sie substantiell interindividuelle Unterschiede bei der computergestützten Wissensaneignung und stellt damit möglicherweise eine wesentliche Gelingensbedingung für die Digitalisierung des Lehrens und Lernens dar.In a field study we examined the relationship between the system usability of a digital learning medium and the learning success of computer-assisted instruction quantitatively. 31 students from two advanced biology courses at a German secondary school took a web-based lesson on cell biology. We found a medium correlation between subjective usability ratings and test scores (r(28) = .384, p < .05). The relationship remained stable even after controlling for personality traits and states relevant to learning success by using multiple regression. Prior knowledge, numerical reasoning, current motivation, and system usability accounted for 52.9% of the observed test score variance. Furthermore, we found a medium correlation between system usability and students interest in the learning task (r(28) = .396, p < .05). We therefore conclude that usability seems to be a significant attribute of interaction when students learn with digital media. The results of our study revealed that usability explained substantial individual differences in computer assisted knowledge acquisition and appears to be an essential success factor for the digital transformation of teaching and learning

Extremizers of the JJ functional with respect to the d1d_1 metric

In previous work, Darvas-George-Smith obtained inequalities between the large scale asymptotic of the $J$ functional with respect to the $d_1$ metric on the space of toric K\"ahler metrics/rays. In this work we prove sharpness of these inequalities on all toric K\"ahler manifolds, and study the extremizing potentials/rays. On general K\"ahler manifolds we show that existence of radial extremizers is equivalent with the existence of plurisupported currents, as introduced and studied by McCleerey.Comment: Results from an REU project. arXiv admin note: text overlap with arXiv:2101.0258

PERANCANGAN DAN IMPLEMENTASI SISTEM KENDALI LAMPU PENERANGAN DENGAN METODE LOGIKA FUZZY

ABSTRAK Dewasa ini kebutuhan cahaya untuk penerangan aktivitas manusia dalam suatu ruang tertentu tak lepas dari pencahayaan oleh lampu listrik. Lampu listrik dalam kinerjanya pasti memanfaatkan energi listrik. Terkadang dalam kehidupan sehari-hari kita lalai dalam mengatur atau mematikan lampu yang menyala, meskipun pencahayaan di sekitar sudah cukup untuk menerangi aktivitas kita. Sehingga membuat energi listrik terbuang percuma begitu saja. Dengan melihat keadaan ini, maka dibuatlah suatu alat pengaturan intensitas cahaya agar kita tidak lagi repot untuk menyalakan dan mematikan lampu. Karena lampu akan hidup secara otomatis dan pencahayaan lampu juga dapat diatur secara otomatis, tergantung pada intensitas cahaya dan keberadaan manusia pada ruangan tersebut. Berdasarkan masalah tadi, maka penulis ingin menciptakan sebuah sistem pengontrolan intensitas cahaya menggunakan kamera untuk mendeteksi keberadaan manusia dalam suatu ruangan dan sensor LDR (Light Dependent Resistor) sebagai pendeteksi intensitas cahaya, yang nantinya bekerja secara terintegrasi untuk menghidupkan atau menyalakan lampu serta mengontrol intensitas pencahayaan lampu secara efektif dan efisien sehingga dapat menghemat energi. Secara keseluruhan, sistem ini bekerja dengan mendeteksi objek berupa keberadaan manusia dalam suatu ruangan. Pendeteksian objek manusia ini menggunakan sensor kamera yang kemudian dilakukan pengolahan terhadap citra yang dihasilkan oleh kamera tersebut untuk menentukan sistem pengontrolan aktif atau tidak. Ketika sistem aktif, sensor LDR berfungsi untuk mendeteksi besar intensitas cahaya dalam ruangan tersebut yang kemudian data tersebut diolah oleh mikrokontroler Raspberry Pi dengan metode fuzzy logic untuk menentukan kondisi driver relay. Kemudian driver relay menentukan besar intensitas pencahayaan lampu. Kata kunci : Lampu, Sensor LDR (Light Dependent Resistor), Kamera, Raspberry Pi, Fuzzy Logic, Cahay

Elaeocarpus (Elaeocarpaceae) endocarps from the Oligo-Miocene of Eastern Australia

Elaeocarpus peterii.sn nov. is described from the Oligo-Miocene Glencoe locality in central Queensland. This species has prominent stellate ridges and fine punctate ornamentation. These features support a close relationship to extant E. steffaris L.S. Smith fronl northeastern Queenlsland.Elaeocarpus clarkei(F. Muell). Selling is redescribed. The punctate ornamentation and large oval endocarps of E. clarkei (F. Meull) are closely comparable to extant E. bancroftii F. Muell. & F.M. Bail. and E. linsmithii G.P. Guymer from north eastern Queensland. Elaeocarpus clarkei is a common element in many oligo-Miocene deep leads in southeastern Australia. The age of some of the deep leads (buried placer deposits) in Victoria, e.g. Haddon and Foster, is discussed; the limited data available suggests a minimum mid-Miocene age for these localities

Combined investigation of collective amplitude and phase modes in a quasi-one-dimensional charge-density-wave system over a wide spectral range

We investigate experimentally both the amplitude and phase channels of the collective modes in the quasi-1D charge-density-wave (CDW) system, K0.3MoO3, by combining (i) optical impulsive-Raman pump-probe and (ii) terahertz time-domain spectroscopy (THz-TDS), with high resolution and a detailed analysis of the full complex-valued spectra in both cases. This allows an unequivocal assignment of the observed bands to CDW modes across the THz range up to 9 THz. We revise and extend a time-dependent Ginzburg-Landau model to account for the observed temperature dependence of the modes, where the combination of both amplitude and phase modes allows one to robustly determine the bare-phonon and electron-phonon coupling parameters. While the coupling is indeed strongest for the lowest-energy phonon, dropping sharply for the immediately subsequent phonons, it grows back significantly for the higher-energy phonons, demonstrating their important role in driving the CDW formation. We also include a reassessment of our previous analysis of the lowest-lying phase modes, whereby assuming weaker electronic damping for the phase channel results in a qualitative picture more consistent with quantum-mechanical treatments of the collective modes, with a strongly coupled amplitudon and phason as the lowest modes

“Gold Dirt:” An Exploratory Study of Beginner Women Farmers’ Experiences with Farmland Tenure Mediating Care for Soil in Willamette Valley, Oregon

This thesis investigates how beginning, women farmers, within in a women farmers’ network in the Willamette Valley, Oregon are accessing land and farming information. Using ethnographic, community-based research methods, I ask how land access mediates their ability to care for their land and soil. Are these farmers interested in fostering “soil health” through methods of care via sustainable farming methods, or through building a long-term relationship with the microbiological-ecology of the soil and does this vary whether they are on leased or owned land? This study also interactions with farmer support institutions, programs, and organizations, both those that exist within the dominant agricultural paradigm and those that came from grassroots beginnings. The findings are examined through a multi-species, logic of care framework and in a discussion of gendered experiences of women as farmers. Part of the basis for this research emanated from an internship in which I worked directly with women farmers’ network coordinators, engaging with this community throughout the research process, creating space for dialogue and feedback upon presenting findings. In-depth interviews were conducted with self-selected informants from the community and those interviews then informed a survey that was sent out to the women farmers’ network. The nuances of their experiences will be highlighted and are as important to understanding the experiences of women farmers as is discussing their obvious differences and similarities