Theory of excitation transfer between two-dimensional semiconductor and molecular layers

The geometry-dependent energy transfer rate from an electrically pumped inorganic semiconductor quantum well into an organic molecular layer is studied theoretically. We focus on F\"orster-type nonradiative excitation transfer between the organic and inorganic layer and include quasi-momentum conservation and intermolecular coupling between the molecules in the organic film. (Transition) partial charges calculated from density-functional theory are used to calculate the coupling elements. The partial charges describe the spatial charge distribution and go beyond the common dipole-dipole interaction. We find that the transfer rates are highly sensitive to variations in the geometry of the hybrid inorganic/organic system. For instance, the transfer efficiency is improved by orders of magnitude by tuning the relative orientation and positioning of the molecules. Also, the operating regime is identified where in-scattering dominates over unwanted back-scattering from the molecular layer into the substrate

Die perfekte Frau - Weiblichkeitsideale in den Illustrierten "Brigitte" und "Praline"

Die vorliegende Diplomarbeit beschäftigt sich mit den Veränderungen und Kontinuitäten in den weiblichen Schönheits-, Verhaltens-, und Sexualitätsidealen in den deutschen Illustrierten Brigitte und Praline im Zeitraum von 1954 bis 1979. Im ersten Teil meiner Arbeit schildere ich die Geschichte der beiden Illustrierten. Der zweite Abschnitt analysiert das in den Illustrierten vermittelte Schönheitsideal. Die thematischen Schwerpunkte liegen dabei auf Mode, dem Schlankheitsideal und der Schönheitspflege. Beide Illustrierte vermitteln ihren Leserinnen im gesamten Untersuchungszeitraum ein eindeutiges Schlankheitsideal. Das Bewahren von Jugendlichkeit durch Schönheitspflege ist ein wiederkehrendes Motiv der beiden Illustrierten. Im dritten Teil meiner Diplomarbeit untersuche ich die Entwürfe von Weiblichkeit und die Verhaltensanweisungen, die Brigitte und Praline ihren Leserinnen präsentieren. Die Themen Mutterschaft, weibliche Berufstätigkeit und die Stellung der Frau in der Familie stehen im Mittelpunkt meiner Analyse. In den fünfziger und sechziger Jahren vermitteln die Illustrierten den Leserinnen, dass Hausarbeit und Kindererziehung ausschließlich Aufgaben der Frau seien. In den siebziger Jahren ändert sich die Einstellung der Zeitschriften zu Familie und Geschlechterrollen. Brigitte und Praline berichten seit den fünfziger Jahren über weibliche Berufstätigkeit. Beiträge der fünfziger Jahre vermitteln den Leserinnen, dass junge Frauen nur bis zur Heirat einer Erwerbsarbeit nachgehen sollen. In den siebziger Jahren finden sich Beiträge zur Gleichberechtigung der Frau im Privat- und Arbeitsleben. Der vierte Abschnitt meiner Diplomarbeit befasst sich mit weiblicher Sexualität. Meine Schwerpunkte liegen auf den Bereichen Sex-Appeal in der Werbung, Verhütung und dem von den Illustrierten vermittelten weiblichen Sexualitätsideal. In beiden Illustrierten ist im Untersuchungszeitraum eine deutliche Zunahme der Verwendung von Sex-Appeal in der Werbung zu erkennen. In den Brigitte-Ausgaben der siebziger Jahre finden sich nur wenige Beiträge, die sich mit dem Thema Sexualität befassen. Im Gegensatz dazu dreht sich eine Praline-Ausgabe dieser Zeit fast ausschließlich um dieses Thema. Am Ende meiner Diplomarbeit schildere ich in einem Resümee die Veränderungen und Kontinuitäten in den weiblichen Schönheits-, Verhaltens-, und Sexualitätsidealen

Öffentlich-private Partnerschaften und Entwicklungspolitik. Kommentierte Bibliographie

Wenige Debatten sind derzeit verwirrender als die über den Sinn und Nutzen öffentlich-privater Partnerschaften (ÖPP, im Englischen : Public-Private Partnerships – PPPs) als Mittel der Entwicklungspolitik. Ein Grund für die Verwirrung besteht darin, dass der Terminus „Public-Private Partnership“ alles andere als eindeutig ist. Zum einen haben sich Regierungen, UN-Organisationen und die Weltbank noch nicht auf eine gemeinsame Definition geeinigt. Zum anderen ist „Public-Private Partnership“ ein..

Partenariats public-privé et politique de développement

Parmi les débats actuels, rares sont ceux qui s’avèrent plus confus que celui sur le sens et l’utilité des partenariats public-privé (PPP, en anglais public-private partnerships) comme instrument de la politique de développement. L’une des raisons de cette confusion réside dans le fait que la notion de partenariat public-privé demeure extrêmement ambiguë. D’une part, les gouvernements, les organes de l’ONU et la Banque mondiale ne sont pas encore parvenus à s’entendre sur une définition commu..

Release of glutamate and CGRP from trigeminal ganglion neurons: Role of calcium channels and 5-HT1 receptor signaling

<p>Abstract</p> <p>Background</p> <p>The aberrant release of the neurotransmitters, glutamate and calcitonin-gene related peptide (CGRP), from trigeminal neurons has been implicated in migraine. The voltage-gated P/Q-type calcium channel has a critical role in controlling neurotransmitter release and has been linked to Familial Hemiplegic Migraine. Therefore, we examined the importance of voltage-dependent calcium channels in controlling release of glutamate and CGRP from trigeminal ganglion neurons isolated from male and female rats and grown in culture. Serotonergic pathways are likely involved in migraine, as triptans, a class of 5-HT₁receptor agonists, are effective in the treatment of migraine and their effectiveness may be due to inhibiting neurotransmitter release from trigeminal neurons. We also studied the effect of serotonin receptor activation on release of glutamate and CGRP from trigeminal neurons grown in culture.</p> <p>Results</p> <p>P/Q-, N- and L-type channels each mediate a significant fraction of potassium-stimulated release of glutamate and CGRP. We determined that 5-HT significantly inhibits potassium-stimulated release of both glutamate and CGRP. Serotonergic inhibition of both CGRP and glutamate release can be blocked by pertussis toxin and NAS-181, a 5-HT_1B/1Dantagonist. Stimulated release of CGRP is unaffected by Y-25130, a 5-HT₃antagonist and SB 200646, a 5-HT_2B/2Cantagonist.</p> <p>Conclusion</p> <p>These data suggest that release of both glutamate and CGRP from trigeminal neurons is controlled by calcium channels and modulated by 5-HT signaling in a pertussis-toxin dependent manner and probably via 5-HT₁receptor signaling. This is the first characterization of glutamate release from trigeminal neurons grown in culture.</p

Filantropo-capitalismo estadunidense e a agenda da saúde global: as fundações Rockefeller e Gates, passado e presente

A Saúde Global, na contemporaneidade, é fortemente marcada por questões econômicas e geopolíticas que, frequentemente, colocam à prova os principais objetivos das Instituições responsáveis pela sua manutenção e manejo. De certo modo, tais questões sempre foram vistas de modo articulado, dada a história das agências responsáveis pela saúde em nível internacional. Assim, duas importantes Fundações – Rockefeller e Bill e Melinda Gates – tiveram/tem importante participação no redirecionamento das ações em Saúde e, principalmente, no que se refere às lógicas de investimento em saúde ligadas à filantropia. Partindo disto, neste texto, a partir de revisão bibliográfica e documental, são discutidas as participações das Fundações em diferentes momentos históricos e as questões emergentes daquilo que chamamos de filantropo-capitalismo. Neste sentido, problematizamos os meios pelos quais tais Fundações interferem na lógica da gestão pública e/ou privada da Saúde Global com o objetivo de alertar sobre a necessidade de atenção acerca das atuais ações e campanhas de saúde financiadas pelo setor privado. Destaca-se, principalmente a quantidade de investidas na indústria farmacêutica em detrimento da melhoria da qualidade de vida e do cumprimento dos direitos humanos fundamentais

Who\u27s accessing emergency food services?

Introduction: Last year, Chittenden Emergency Food Shelf provided 1,260,517 pounds of food to over 11,000 people each month via groceries, hot meals and home delivery, supplying an average of almost 40% of food for families. CEFS seeks to improve their services and offerings by better understanding the demographics, food preference, and needs of the clients they serve. Our goal was to collect demographic and utilization data to identify areas where CEFS could enhance services and improve client access to healthful food.https://scholarworks.uvm.edu/comphp_gallery/1208/thumbnail.jp

Neutral and Charged Inter-Valley Biexcitons in Monolayer MoSe2_2

In atomically thin transition metal dichalcogenides (TMDs), reduced dielectric screening of the Coulomb interaction leads to strongly correlated many-body states, including excitons and trions, that dominate the optical properties. Higher-order states, such as bound biexcitons, are possible but are difficult to identify unambiguously using linear optical spectroscopy methods alone. Here, we implement polarization-resolved two-dimensional coherent spectroscopy to unravel the complex optical response of monolayer MoSe$_2$ and identify multiple higher-order correlated states. Decisive signatures of neutral and charged inter-valley biexcitons appear in cross-polarized two-dimensional spectra as distinct resonances with respective ~20 meV and ~5 meV binding energies--similar to recent calculations using variational and Monte Carlo methods. A theoretical model taking into account the valley-dependent optical selection rules reveals the specific quantum pathways that give rise to these states. Inter-valley biexcitons identified here, comprised of neutral and charged excitons from different valleys, offer new opportunities for creating exotic exciton-polariton condensates and for developing ultrathin biexciton lasers and polarization-entangled photon sources

Plasmonics on nanostructures for cell manipulation

A plasmon resonance based method for introducing foreign material into living cells is presented. By illuminating gold-coated or structured surfaces, near field enhancement is employed to selectively open the cell membrane using ultrashort laser pulses

The Grizzly, October 28, 1983

CampusBooks Speaks Out • C and C Course Offered • Zack Is Back In Bronze • Peace Rally Held • Give Us A Little Bit Of Credit • Respect Is Goal Of Liberal Education • Homecoming: A Big Success • Nobel Prize Awarded • Spirit Week Begins • The Talented Two-Some • The Stone Age is Back • Crown Royal Features Ultimate Competition • Lady Bears Prepare For Penn State Rivalry • U.C. Soccer Continues Winning Ways • Grizziles Roll Over Lebanon Valleyhttps://digitalcommons.ursinus.edu/grizzlynews/1105/thumbnail.jp