Materials Literature
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Nowadays there is great empathy from society for products from renewable resources, due to growing awareness of the finiteness of natural resources. A very common residue of agribusiness and generated on a large scale, being largely discarded in landfills, is coconut shell. With the objective of giving a benefit to th…
An der Elektronen-Stretcher-Anlage ELSA des Physikalischen Instituts der Universität Bonn werden derzeit hadronenphysikalische Doppelpolarisationsexperimente im Rahmen des transregionalen Sonderforschungsbereichs SFB/TR 16 "Elektromagnetische Anregung subnuklearer Systeme" durchgeführt. Der für diese Untersuchungen be…
Electrochemical reduction of CO2 to form useful chemicals or fuels is a potentially efficient method of CO2 utilization and recycling [1], particular to liquid fuels (for example HCOOH or HCOO-),whcih could offer a carbon neutral solution for a variety of energy applications. For large-scale conversion of CO2 to fuels…
Depuis ces dernieres annees, de plus en plus de molecules-candidates entrees dans le pipelinedes industriels pharmaceutiques ont un probleme de solubilite dans l'eau. D'apres differentsauteurs, le pourcentage des candidats faiblement solubles dans l'eau est de l'ordre de 60%-75%. Plusieurs approches galeniques sont ma…
An exact mapping of the tight-binding Hamiltonian for a graphene's nanoribbon under any armchair uniaxial strain into an effective one-dimensional system is presented. As an application, for a periodic modulation we have found a gap opening at the Fermi level and a complex fractal spectrum, akin to the Hofstadter butt…
As propriedades fisico-quimicas, eletricas, magneticas e opticas de uma superficie podem ser vistas como funcao de sua estrutura eletronica que e fortemente relacionada a estrutura atomica. Alem disso, a criacao de uma superficie representa uma quebra da periodicidade em uma direcao do cristal, o que pode acarretar em…
Quantum effects in material systems are often pronounced at low energies and become insignificant at high temperatures. We find that, perhaps counterintuitively, certain quantum effects may follow the opposite route and become sharp when extrapolated to high temperature within a classical liquid phase. In the current…
Tap density of a granular powder is often linked to the flowability via Carr Index that measures how tight a powder can be packed, under an assumption that more easily packed powders usually flow poorly. Understanding how particles are packed is important for revealing why a powder flows better than others. There are…
The strength of most metals used in daily life scales with either an internal or external length scale. Empirically, this is characterized by power-laws persisting to six orders of magnitude in both strength and length scale. Attempts at understanding this scaling have generally been based on a specific mechanism. How…
Quantum effects in material systems are often pronounced at low energies and become insignificant at high temperatures. We find that, perhaps counterintuitively, certain quantum effects may follow the opposite route and become sharp when extrapolated to high temperature within a classical liquid phase. In the current…
In this presentation the synthesis and properties of a series of novel sulfonated multiblock copolyimides (SPIs) with flexible hydrophobic blocks will be reported. in comparison with the random SPI membrane, the multiblock SPI membranes exhibited greatly reduced in-plane swelling ratio and significantly enhanched prot…
Trabalhos ecologicos com a comunidade fitoplanctonica, como base para monitoramentos de ambientes aquaticos sao frequentes e de grande importância, principalmente em ambientes que sofreram acoes antropogenicas, como represamentos, os quais modificam atributos quimicos, fisicos e ecologicos dos ambientes aquaticos. Por…
With an increase in demand for ecofriendly vehicles, the automotive industry is pushing towards multi-layer and multi-material manufacturing.The ability to join a variety of materials is becoming an increasing concern and area of focus for many vehicle manufacturers.Rapid nailing is a possible method for joining these…
limitaes do modelo
Phytohormone auxin plays an important role in regulating plant development. Directional (polar) cell-to-cell auxin transport creates auxin gradients within plant tissues, which trigger a specific developmental response. The vast majority of available data concerns angiosperms. Lower land plants have been much less exp…
Une nouvelle famille de vitrocéramiques, avec une microstructure inédite, a été fabriquée par une cristallisation contrôlée des verres dans le système GeSe2-Sb2Se3-CuI. L'influence de la composition et du processus de cristallisation des verres de base, sur la microstructure et sur l’intensité du photo-courant des vit…
International audience
Τα ραδιονουκλίδια αποτελούν μέρος του φυσικού περιβάλλοντος και η ακτινοβολία που εκπέμπουν επηρεάζει σημαντικά τη ζωή μας. Οι ανθρωπογενείς δραστηριότητες από τα μέσα του 20ου αιώνα εμπλουτίζουν επιπλέον το περιβάλλον με τεχνητά ραδιονουκλίδια ή διαταράσσουν την κατά τόπους υπάρχουσα φυσική ισορροπία. Οι διαρκώς αυξα…
本发明公开了一种在室温条件下催化1-丁烯异构化合成2-丁烯的方法。其特征在于，该方法在无氧或有氧条件下，使用负载型贵金属催化剂，在室温下催化1-丁烯异构化制备2-丁烯。实现降低反应能耗、简化生产装备、避免排放燃烧尾气；室温下氧化性气体仅对反应气有活化作用而不会过氧化为二氧化碳等，能进一步提高反应活性并降低对原料纯度的要求；使用的催化剂为负载型贵金属催化剂，原料广泛、制备简单：活性组分为钯、金、铂、银、铑中的至少一种，载体为氧化硅、KIT-6分子筛、Hβ分子筛、ZSM-5分子筛、USY分子筛等中任意一种或多种混合组分。该工艺过程符合绿色生产工艺要求，具有推广的价值。 \n 一种在室温条件下催化1‑丁烯异构化合成2‑丁烯的方法，其特征…
A medida da atividade de radonio (222Rn) no ar ambiental tem sido feita intensamente nas ultimas quatro decadas, pelo fato de ser este o contaminante natural mais importante a que o homem esta sujeito. Sabe-se que os filhos do 222Rn sao os verdadeiros contaminantes a serem considerados no caso da contaminacao de ambie…