Charge polarization at catalytic metal-support junctions : Part B : Theoretical modeling of Kelvin probe force microscopy

Existing models for the analysis of Kelvin probe microscopy experiments are extended and used to analyze the experimental electrical potential profiles for a Pt/TiO2 model nanoparticle. The derived model reproduces in detail the Kelvin probe image that reveals a characteristic ring-shaped negative charge zone at the surface around the particle: A planar negative charge zone at the surface of the support extends beyond the diameter of the Pt particle. It is compensated mostly by a planar layer of positive charges in the metal across the interface, and by a smaller number of positive charges at the metal-air interface. These latter charges determine the positive electrical potential of the metal particle, and they are likely responsible for the extent of the metal-support interaction in catalytic reactions.http://pubs.acs.org/journal/jpcafh2017-06-30hb2016Chemistr

Establishment and Impact of the Musk Thistle Head Weevil, 'Rhinocyllus conicus', and the Rosette Weevil, 'Trichosirocalus horridus', for Control of Musk Thistle, 'Carduus nutans', in Oklahoma

Department of Entomology and Plant Patholog

Conceptual fusion of the logical framework approach and outcome mapping

This paper describes the rational for and the process of creating a fusion model incorporating OM and LFA. This is the output of an OMLC funded small-scale research grant

Magnetic properties and the superatom character of 13-atom platinum nanoclusters

13-atom platinum nanoclusters have been synthesized quantitatively in the pores of the zeolites NaY and KL. They reveal highly interesting magnetic properties like high-spin states, a blocking temperature, and super-diamagnetism, depending heavily on the loading of chemisorbed hydrogen. Additionally, EPR active states are observed. All of these magnetic properties are understood best if one considers the near-spherical clusters as analogs of transition metal atoms with low-spin and high-spin states, and with delocalized molecular orbitals which have a structure similar to that of atomic orbitals. These clusters are, therefore, called superatoms, and it is their analogy with normal atoms which is in the focus of the present work, but further phenomena, like the observation of a magnetic blocking temperature and the possibility of superconductivity, are discussed.http://www.mdpi.com/journal/magnetochemistryhb201

Platinum-hydrogen vibrations and low energy electronic excitations of 13-atom Pt nanoclusters

Please read abstract in the article.http://www.rsc.org/pccp2015-08-28hb201

Konstrukcijsko ojačanje geotekstila žičanim pletenim mrežama od čelika visoke čvrstoće

Za uspješnu i dugotrajnu stabilizaciju prirodnih pokosa i novih usjeka u nestabilnim tlima i trošnim stijenama vrlo je važna obnova vegetacije. U tu svrhu vrlo učinkovito može biti tzv. trodimenzionalno geopletivo za kontrolu erozije u kombinaciji sa suhom sjetvom i hidrosjetvom. S druge strane 3D konstrukcija smanjuje energiju udara kišnih kapi te erodivnu silu vode na pokosu. Geotekstili, koji se inače upotrebljavaju kao pomoć pri sjetvi, imaju većinom malu snagu te su zbog toga učinkoviti samo na blažim pokosima ili u kombinaciji sa žičanim pletenim mrežama. U zadnjih 15 godina mreže od čelika visoke čvrstoće, korištene za stabilizaciju pokosa, pokazale su se kao dobro rješenje u kombinaciji s čavlanjem tla. Takve mreže mogu prenijeti i veće sile, a zahvaljujući velikoj otpornosti na probijanje, opterećenje na čavlanje bolje se prenosi. Njihovu prilagodbu za stabilizaciju površinskih nestabilnosti moguće je izvesti programom za projektiranje, razvijenim na temelju tzv. RUVOLUM® koncepta. Kako bi se područje primjene gore navedenih geopletiva za kontrolu erozije proširilo, primjenjuju se u kombinaciji s laganom mrežom od čelika visoke čvrstoće, što im povećava nosivost na 53 kN/m. Većinom se koriste kao rasprostrta zaštita i/ili pomoć pri uzgoju nove vegetacije bez čavlanja tla. Stečeno iskustvo sada se primjenjuje u izradi proizvoda koji su kombinacija dobrih strana žičane pletene mreže od čelika visoke čvrstoće i geopletiva za kontrolu erozije. Opterećenje od 150 kN/m i otpornost na probijanje od 180 kN može se prenijeti na čavlanje ako se koristi sustav pričvrsnih ploča