116 research outputs found

    The Lace Curtains of Berlin

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    The project "The Lace Curtains of Berlin" is based on the author’s assumption that the said lace curtains are very efficient communication tools. The curtains’ main function seems to be ornamental since they don't block much light and don't guarantee much privacy. In general, ornaments can be Channels, Signals, or Messages. After rejecting lace curtains as Channels, the essay examines the remaining possibilities of lace curtains as Messages or Signals. The author leans towards the theory of curtains as Messages and hopes to inspire someone to study these messages seriously.Le projet « les rideaux en dentelle à Berlin » est conçu à partir de l’hypothèse de l’auteur que ces rideaux sont des moyens de communication très efficaces. La fonction principale des rideaux semble être décorative puisqu’ils ne bloquent pas complétement la lumière et ne garantissent guère l’intimité. En général les décors peuvent être des Voies, des Signaux ou des Messages. Après avoir réfuté l’utilisation des rideaux comme des voies de communication, cet essai examine les autres fonctions des rideaux de dentelle comme Messages ou comme Signaux. L’auteur s’oriente vers la théorie des rideaux comme Messages and espère ainsi encourager quelqu’un à étudier ces messages sérieusement.El proyecto "The lace Curtains of Berlin" (las cortinas de encaje de Berlín) se basa en la idea de que las cortinas de encaje son herramientas de comunicación muy eficientes.La función principal de las mismas parece ser ornamental, pues ni bloquean mucha luz ni garantizan demasiada privacidad. En general, los ornamentos pueden ser Canales, Señales o Mensajes. Luego de rechazar las cortinas de encaje en tanto que Canales, el ensayo examina las otras dos posibilidades: las cortinas de encaje como Mensajes y como Señales. El autor se inclina por la teoría de la cortinas como Mensajes, con el deseo de inspirar otros autores a estudiar estos mensajes de forma seria.

    Comparación de efectividad de tres emamectinas comerciales para controlar Spodoptera frugiperda en el cultivo de Zea mays en el C.P. Los Patos, Cajaruro, 2022

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    En la presente investigación “Comparación de efectividad de tres emamectinas comerciales para controlar Spodoptera frugiperda en el cultivo de Zea mays en el C.P. Los Patos, Cajaruro, 2022”. Con el problema ¿Cuál de las tres emamectinas comerciales será más efectiva para el control de Spodoptera frugiperda en el cultivo de Zea mays en el C.P. Los Patos, Cajaruro, 2022?, el objetivo general fue Comparar la efectividad de tres emamectinas comerciales para controlar Spodoptera frugiperda en el cultivo de Zea mays en el C.P. Los Patos, Cajaruro, 2022. Se utilizó diseño experimental completamente al azar (DCA), 4 tratamientos y 4 repeticiones incluyendo el testigo siendo los tratamientos: T0 Testigo, T1 Coloso, T2 Skirla, T3 Verzus. La muestra fue de 325 plantas, el instrumento fue la guía de observación. Se realizaron 2 aplicaciones y evaluó antes de aplicar, 3,5,7 DD1A, antes de 2 aplicación 3,5,7 DD2A. los resultados indican que la emamectina más efectiva fue T2 Skirla que a los 3DDA tuvo 96.94 % de efectividad, seguido T1 Coloso con 94.5% y T3 Verzus, con 94.21% de efectividad. A los 7DD2A el T2: Skirla mostró la menor cantidad de larvas vivas 3.75. Se concluye que de las 3 emamectinas Skirla muestra mejor control para el gusano cogollero en el cultivo de maí

    Saturation effect for dependence of the electrical conductivity of planar oriented nematic liquid crystal 6CB on the concentration of Cu7PS6 nanoparticles

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    The influence of Cu7PS6 nanoparticles with the average size 117 nm on the dielectric properties of planar oriented nematic liquid crystal 6CB has been investigated within the frequency range 10(1) ...10(6) Hz and at the temperature 293 K. It has been shown that when changing the concentration of nanoparticles within the range 0 to 1 wt.%, the conductivity of the liquid crystal changes stronger than its dielectric permittivity. It has been shown that the electrical conductivity increases monotonously with increasing the concentration of nanoparticles. However, for this dependence a saturation effect is observed. The mechanism of this effect was proposed.info:eu-repo/semantics/publishedVersio

    Influence of cation substitution on phase transition and optical absorption edge in Cu₆(P₁₋xAsx)S₅I mixed crystals

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    Cu₆(P₁₋xAsx)S₅I mixed crystals were grown using chemical vapour transport. Temperature isoabsorption investigations of optical absorption edge enable to reveal anomalies typical for the first- and second-order phase transitions as well as to construct the x, T-diagram. The spectrometric measurements of the optical absorption edge in Cu₆(P₁₋xAsx)S₅I superionic mixed crystals were carried out within the temperature range 77-320 K. The influence of temperature and composition on optical absorption edge, parameters of exciton-phonon interaction as well as ordering-disordering processes in Cu₆(P₁₋xAsx)S₅Isuperionic mixed crystals have been studied

    Optical studies of as-deposited and annealed Cu₇GeS₅I thin films

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    Cu₇GeS₅I thin films were obtained by non-reactive radio frequency magnetron sputtering onto silicate glass substrates. Optical transmission spectra of as-deposited and annealed Cu₇GeS₅I thin films were measured in the temperature interval 77–300 K. The temperature behaviour of Urbach absorption edge and dispersion of refractive index for as-deposited and annealed Cu₇GeS₅I thin films was analyzed. Influence of annealing on the optical parameters and disordering processes in Cu₇GeS₅I thin films was studied

    Structural, electrical and optical investigations of Cu₆PS₅Br-based thin film deposited by HiTUS technique

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    Cu₆.₃₅P₁.₇₇S₄.₇₂Br₀.₁₅ thin film was obtained using the high target utilization sputtering onto c-cut sapphire substrates. X-ray diffraction studies show the film to be amorphous with some crystalline inclusions. SEM investigations indicate formation of periodical “forest-like” quasi-two-dimensional pillared structure. Electrical conductivity of Cu₆.₃₅P₁.₇₇S₄.₇₂Br₀.₁₅ thin film was measured in the temperature interval 4.5…300 K, three regions with different activation energy were revealed. Optical constants were obtained using the technique of spectroscopic ellipsometry and used for calculation of optical absorption spectrum. Optical absorption edge has an exponential form, the Urbach energy shows the significant disordering in Cu₆.₃₅P₁.₇₇S₄.₇₂Br₀.₁₅ thin film

    Introgression across evolutionary scales suggests reticulation contributes to Amazonian tree diversity

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    This is the final version. Available from Wiley via the DOI in this record.The data that support the findings of this study are openly available from online repositories. All raw reads generated with the targeted bait capture and ddRADseq methods are available on the NCBI Sequence Read Archive with the Accession nos SAMN13439069‐SAMN13439140 and SAMN13441804‐SAMN13441974, respectively, under the BioProject number PRJNA592723. All full phylogenomic sequence alignments, single‐accession‐per‐species alignments and tree files, bgc input files, Stacks output files and the Detarioideae bait kit sequence file are found on Dryad (https://doi.org/10.5061/dryad.k3j9kd53w). Data are under embargo until publication, and any further data required are available from the corresponding author upon reasonable request.Hybridization has the potential to generate or homogenize biodiversity and is a particularly common phenomenon in plants, with an estimated 25% of plant species undergoing interspecific gene flow. However, hybridization in Amazonia's megadiverse tree flora was assumed to be extremely rare despite extensive sympatry between closely related species, and its role in diversification remains enigmatic because it has not yet been examined empirically. Using members of a dominant Amazonian tree family (Brownea, Fabaceae) as a model to address this knowledge gap, our study recovered extensive evidence of hybridization among multiple lineages across phylogenetic scales. More specifically, using targeted sequence capture our results uncovered several historical introgression events between Brownea lineages and indicated that gene tree incongruence in Brownea is best explained by reticulation, rather than solely by incomplete lineage sorting. Furthermore, investigation of recent hybridization using ~19,000 ddRAD loci recovered a high degree of shared variation between two Brownea species that co-occur in the Ecuadorian Amazon. Our analyses also showed that these sympatric lineages exhibit homogeneous rates of introgression among loci relative to the genome-wide average, implying a lack of selection against hybrid genotypes and persistent hybridization. Our results demonstrate that gene flow between multiple Amazonian tree species has occurred across temporal scales, and contrasts with the prevailing view of hybridization's rarity in Amazonia. Overall, our results provide novel evidence that reticulate evolution influenced diversification in part of the Amazonian tree flora, which is the most diverse on Earth.Natural Environment Research Council (NERC)Genetics Societ

    Targeted sequencing supports morphology and embryo features in resolving the classification of Cyperaceae tribe Fuireneae s.l.

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    Molecular phylogenetic studies based on Sanger sequences have shown that Cyperaceae tribe Fuireneae s.l. is paraphyletic. However, taxonomic sampling in these studies has been poor, topologies have been inconsistent, and support for the backbone of trees has been weak. Moreover, uncertainty still surrounds the morphological limits of Schoenoplectiella, a genus of mainly small, amphicarpic annuals that was recently segregated from Schoenoplectus. Consequently, despite ample evidence from molecular analyses that Fuireneae s.l. might consist of two to four tribal lineages, no taxonomic changes have yet been made. Here, we use the Angiosperms353 enrichment panel for targeted sequencing in order to: (1) clarify the relationships of Fuireneae s.l. with the related tribes Abildgaardieae, Eleocharideae and Cypereae; (2) define the limits of Fuireneae s.s., and (3) test the monophyly of Fuireneae s.l. genera with emphasis on Schoenoplectus and Schoenoplectiella. Using more than a third of Fuireneae s.l. diversity, our phylogenomic analyses strongly support six genera and four major Fuireneae s.l. clades that we recognise as tribes: Bolboschoeneae stat.nov., Fuireneae s.s., Schoenoplecteae, and Pseudoschoeneae tr.nov. These results are consistent with morphological, micromorphological (nutlet epidermal cell shape), and embryo differences detected for each tribe. At the generic level, most sub‐Saharan African perennials currently treated in Schoenoplectus are transferred to Schoenoplectiella. Our targeted sequencing results show that these species are nested in Schoenoplectiella, and their treatment here is consistent with micromorphological and embryo characters shared by all Schoenoplectiella species. Keys to recognised tribes and genera are provided

    Optical absorption edge and luminescence in phosphorous-implanted Cu₆PS₅X (X = I, Br) single crystals

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    Implantation of Cu6PS5X (X = I, Br) single crystals was carried out for different values of fluence with using P⁺ ions; the energy of ions was 150 keV. For the implanted Cu₆PS₅X crystals, the structural studies were performed using the scanning electron microscopy technique and energy-dispersive X-ray spectroscopy. Spectrometric studies of optical absorption edge and luminescence were carried out within the temperature range 77…320 K. The influence of ionic implantation on luminescence spectra, parameters of Urbach absorption edge, parameters of exciton-phonon interaction as well as ordering-disordering processes in Cu₆PS₅X (X = I, Br) superionic conductors have been studied

    Optical absorption edge and luminescence in phosphorous-implanted Cu₆PS₅X (X = I, Br) single crystals

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    Implantation of Cu₆PS₅X (X = I, Br) single crystals was carried out for different values of fluence with using P+ ions; the energy of ions was 150 keV. For the implanted Cu₆PS₅X crystals, the structural studies were performed using the scanning electron microscopy technique and energy-dispersive X-ray spectroscopy. Spectrometric studies of optical absorption edge and luminescence were carried out within the temperature range 77…320 K. The influence of ionic implantation on luminescence spectra, parameters of Urbach absorption edge, parameters of exciton-phonon interaction as well as ordering-disordering processes in Cu₆PS₅X (X = I, Br) superionic conductors have been studied
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