Exciton-optical phonon coupling in II-VI semiconductor nanocrystals.

This perspective reviews the topic of exciton-phonon coupling (EPC) in II-VI semiconductor nanocrystals. First, EPC is defined and its relevance is discussed, both as it influences the properties of the materials relevant to applications and as a probe of electronic structure. Different experimental and theoretical methods for probing EPC are outlined. Results for several different classes of II-VI nanocrystals are summarized. Finally, possible future directions are outlined

“I’ll Have What She’s Having!”: Depictions of Orgasm in Heterosexual Pornography Labeled for Female Consumption

This research paper aims to discuss and bring awareness to orgasm representation within heterosexual pornography that is specifically labeled for female consumption. Major areas of focus are on the orgasm gap and clitoral stimulation, sexual satisfaction in heterosexual relationships, and aggressive and violent behaviors depicted in pornography and sexual interactions. These areas are crucial because current research is lacking; it is necessary for more research to be conducted that focuses on orgasm representation and satisfaction. If realistic depictions of sexual intercourse are shown in pornographic content, it may bring expectations for consumers that could lead to higher rates of sexual satisfaction for all parties. Depictions of orgasm were recorded and observed through the viewing of popular pornographic videos from a mainstream pornography website. Orgasms per gender were classified based on their category of overt versus ambiguous, then further broken down into groups based on visual and auditory displays of pleasure. This research hopes to answer as to which sex has higher orgasm representation in pornography and how these results contribute to false narratives in terms of sexual expectations and satisfaction

Woman-to-woman sexual assault : a situational analysis

Selon la méthode d’analyse situationnelle élaborée en théorie ancrée, cette thèse explore l’expérience d’agression sexuelle entre femmes telle que vécue par les survivantes et abordée dans la théorie, les discours et la prestation de services. Ce travail examine les enjeux de reconnaissance et de déni et leurs impacts sur les vies de survivantes d’agression sexuelle entre femmes. Les deux premiers chapitres étudient l’invisibilisation de cette violence sexuelle par les théories datant des années 1970 jusqu’à aujourd’hui. Suivant Butler, je propose une perspective théorique sur l’agression sexuelle permettant la coexistence des normes de genre et de leurs transgressions. Je soutiens que les normes de genre appliquées à la violence sexuelle ont une incidence sur ces actes et sur leur reconnaissance. Dans le chapitre trois, des récits de survivantes sont interprétés en mobilisant la théorie phénoménologique; je souligne en quoi les émotions et l’espace sont co-impliqués dans les expériences d’agression sexuelle des participantes. Je présente un parcours commun aux participantes décrivant la transformation du sentiment d’être pris dans un piège vers un certain degré de liberté dans les espaces de guérison. Inspiré par Becker, le chapitre quatre déploie une analyse des « mondes sociaux » qui fournit un contexte institutionnel à ces agressions sexuelles. Je décris comment les pratiques et discours liés à l’agression sexuelle et aux milieux de prestation de services évoluent d’un paradigme genré vers une version non genrée. J’identifie les fournisseurs de services et les survivantes qui reconnaissent les agressions sexuelles entre femmes comme membres de l’« Anti-Violence Project Subworld » (« sous-monde du projet anti-violence »). Les personnes qui comprennent l’agression sexuelle comme forme de violence uniquement perpétrée par les hommes contre les femmes sont identifiées comme membres du « Violence Against Women Subworld » (« sous-monde de violence contre les femmes »). Dans le chapitre cinq sont identifiées quatre approches discursives appliquées aux agressions sexuelles entre femmes. Elles sont : « Gendered Silencing » (« silence genrée »), « Gendered Contextualizing » (« contextualisation genrée »), « Degendered Agentification » (« agentivité dégenrée ») et « Degendered Agentified Contextualization » (« contextualisation dégenrée avec agentivité »).Based on the Grounded Theory Method of Situational Analysis, this dissertation examines woman-to-woman sexual assault as experienced by survivors, and as negotiated in theory, discourse, and service provision. It illuminates dynamics of recognition and denial that influence the lives of woman-to-woman sexual assault survivors. It begins in Chapters One and Two by looking at ways woman-perpetrated sexual violence is obscured by theories dating from the 1970s to present. Drawing on Butler, I advance a theoretical perspective which accommodates the coexistence of gender norms and their transgressions in thinking about sexual assault. I suggest that gendered norms for sexual violence influence acts on the one hand, and recognition on the other. In Chapter Three, survivor narratives are framed by phenomenological theory as I focus on how space and emotion are co-implicated in participant experiences of sexual assault. I present a common trajectory in which survivor participants describe going from feeling trapped to finding some degree of freedom in healing spaces. The fourth chapter deploys a “social worlds” analysis, in the tradition of Becker, to provide an institutional context for woman-to-woman sexual assault. I describe the ways practices and discourses in sexual assault and related contexts of service provision are moving from a rigidly gendered paradigm toward a de-gendered one. I conceptualize providers and survivors who recognize woman-to-woman sexual assault as members of the “Anti-Violence Project Subworld.” Those who understand sexual assault as a fundamentally man-on-woman form of violence are conceptualized as members of the “Violence Against Women Subworld.” Finally, in Chapter Five, this dissertation identifies four discursive approaches to woman-to-woman sexual assault. They are referred to as “Gendered Silencing, ” “Gendered Contextualizing, ” “Degendered Agentification, ” and “Degendered Agentified Contextualization.

Weak Exciton-Phonon Coupling in CdSe Nanoplatelets from Quantitative Resonance Raman Intensity Analysis

Resonance Raman spectra, cross sections, and depolarization ratios have been measured for 4.5 monolayer thick CdSe nanoplatelets dispersed in chloroform. Five excitation wavelengths between 514.5 and 476.5 nm were employed. The resonance Raman spectra are dominated by the longitudinal optical (LO) phonon near 201 cm–1 and its overtone, as in CdSe quantum dots. The absolute scattering intensity is much higher for excitation on resonance with the sharp, lowest-energy heavy-hole to conduction band transition than with higher energy transitions, decreasing by about a factor of 30 between 514.5 and 496.5 nm excitation. The LO phonon overtone is weak directly on resonance with the heavy-hole transition but much stronger at higher excitation energies, a result that is reproduced by simulations of the spectra using standard resonance Raman intensity theory. The absolute Raman cross sections imply a Huang–Rhys parameter for the LO phonon of about 0.08 on resonance with the lowest heavy-hole transition. This is a factor of 2–3 lower than found previously for CdSe quantum dots. The depolarization ratios on resonance with the lowest heavy-hole excitonic transition are slightly higher than expected for a degenerate, plane-polarized transition even when the local field factors are taken into account

Racial socialization in White American families: An exploration of the roles of parental racial identity, parental racial attitudes, and racial socialization messages

This paper explores the relationship among White parents’ racial attitudes, racial identity development, and racial socialization strategies. Parents were asked to use both quantitative measures and qualitative vignettes to report how they would talk to their pre-adolescent child about race. In line with previous research (Hughes et al., 2006), parents predominantly adopted an egalitarian socialization strategy, suggesting that everyone should be treated the same, regardless of race. Although White parents indicated they found both present and future discussions of race important, when given the opportunity with qualitative vignettes, many parents did not include race or racial issues in their responses. This indicates a pattern of colorblind or colormute socialization that has been reflected in White racial socialization literature; the idea that race should not matter and should not be discussed with children. Egalitarian socialization was linked to White racial identity statuses, but not related to racial bias or school diversity estimates

Comparison of three empirical force fields for phonon calculations in CdSe quantum dots

Three empirical interatomic force fields are parametrized using structural, elastic, and phonon dispersion data for bulk CdSe and their predictions are then compared for the structures and phonons of CdSe quantum dots having average diameters of ˜2.8 and ˜5.2 nm (˜410 and ˜2630 atoms, respectively). The three force fields include one that contains only two-body interactions (Lennard-Jones plus Coulomb), a Tersoff-type force field that contains both two-body and three-body interactions but no Coulombic terms, and a Stillinger-Weber type force field that contains Coulombic interactions plus two-body and three-body terms. While all three force fields predict nearly identical peak frequencies for the strongly Raman-active "longitudinal optical" phonon in the quantum dots, the predictions for the width of the Raman peak, the peak frequency and width of the infrared absorption peak, and the degree of disorder in the structure are very different. The three force fields also give very different predictions for the variation in phonon frequency with radial position (core versus surface). The Stillinger-Weber plus Coulomb type force field gives the best overall agreement with available experimental data

Ash beneficiation for the enhancement of electrical transmission infrastructure

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