Search results for " function"
showing 10 items of 9395 documents
Adenine nucleotide metabolism during anoxia and postanoxic recovery in insects
1996
Severe hypoxia (anoxia), if maintained for more than a few minutes, causes irreversible damage in humans and other mammals. Why mammals are so vulnerable to anoxia is not fully understood. It is therefore of interest to study animals that are more tolerant of anoxia in order to identify physiological and metabolic properties that are correlated with a high tolerance of anoxia. Insects have high metabolic rates and their energy metabolism is dependent on aerobic ATP production. In insects, as in mammals, anoxia causes a rapid breakdown of physiological function, resulting in a state similar to rigor mortis. This is accompanied by a precipitous decrease in metabolic rate. In contrast to mamma…
Atomistic Insights into Nitrogen-Cycle Electrochemistry: A Combined DFT and Kinetic Monte Carlo Analysis of NO Electrochemical Reduction on Pt(100)
2017
Electrocatalytic denitrification is a promising technology for the removal of NOx species in groundwater. However, a lack of understanding of the molecular pathways that control the overpotential and product distribution have limited the development of practical electrocatalysts, and additional atomic-level insights are needed to advance this field. Adsorbed NO has been identified as a key intermediate in the NOx electroreduction network, and the elementary steps by which it decomposes to NH4+, N2, NH3OH+, or N2O remain a subject of debate. Herein, we report a combined density functional theory (DFT) and kinetic Monte Carlo (kMC) study of this reaction on Pt(100), a catalytic surface that i…
Study of the role of sulfur functionalities in humic acids for uranium(VI) complexation
2009
Humic substances influence the speciation and migration behavior of toxic and radiotoxic metal ions, such as actinides, in the environment. Depending on their origin, humic substances contain different amounts of sulfur ranging from 0.1 to 3.6% and 0.5 to 1.43% in soil and aquatic humic substances, respectively [1]. Reduced, intermediately oxidized and highly oxidized sulfur functionalities occur in humic substances [1]. Although sulfur functionalities occur in small concentrations, they can play an important role in the complexation of selected metal ions. Knowledge about the impact of sulfur functionalities on the metal ion complexation by humic substances and their significance compared …
From Single Molecules to Nanoscopically Structured Materials: Self-Assembly of Metal Chalcogenide/Metal Oxide Nanostructures Based on the Degree of P…
2011
A chemically specific and facile method for the immobilization of metal oxide nanoparticles onto the surface of IF-MoS2 nested fullerenes is reported. The modification strategy is based on the chalcophilic affinity of transition metals such as Fe2+/Fe3+, Fe3+, or Zn2+ as described by the Pearson HSAB concept. The binding capabilities of the 3d metals are dictated by their Pearson hardness. Pearson hard cations such as Fe3+ (Fe2O3) do not bind to the chalcogenide surfaces; borderline metals such as Fe2+ (Fe3O4) or Zn2+ (ZnO) bind reversibly. Pearson-soft metals like Au bind irreversibly. The immobilization of metal oxide nanoparticle colloids was monitored by transmission electron microscopy…
Measurement of the Fluctuations in the Number of Muons in Extensive Air Showers with the Pierre Auger Observatory
2021
The successful installation, commissioning, and operation of the Pierre Auger Observatory would not have been possible without the strong commitment and effort from the technical and administrative staff in Malargue. We are very grateful to the following agencies and organizations for financial support: Argentina-Comision Nacional de Energia Atomica, Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT), Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Gobierno de la Provincia de Mendoza, Municipalidad de Malargue, NDM Holdings and Valle Las Lenas; in gratitude for their continuing cooperation over land access; Australia-the Australian Research Council; Brazil…
Hybrid evolutionary multi-objective optimization with enhanced convergence and diversity
2011
The effect of Ag, Pb and Bi impurities on grain boundary sliding and intergranular decohesion in Copper
2016
We investigate the changes in grain boundary sliding (GBS) and intergranular decohesion in copper (Cu), due to the inclusion of bismuth (Bi), lead (Pb) and silver (Ag) substitutional impurity atoms at a $\Sigma$5 (0 1 2) symmetric tilt grain boundary (GB), using a first-principles concurrent multiscale approach. We first study the segregation behavior of the impurities by determining the impurity segregation energy in the vicinity of the GB. We find that the energetically preferred sites are on the GB plane. We investigate the intergranular decohesion of Cu by Bi and Pb impurities and compare this to the effect of Ag impurities by considering the work of separation, $W_s$ and the tensile st…
The British-Irish Border in the Context of Brexit
2020
Przedmiot artykułu stanowią rozważania dotyczące konsekwencji Brexitu dla funkcjonowania granicy pomiędzy Irlandią a Irlandią Północną. Autor wyjaśnia, czym jest ta granica w warunkach, kiedy Wielka Brytania nie jest już członkiem Unii Europejskiej, a więc przebieg tej granicy może stanowić barierę dla swobodnego przepływu osób, towarów, kapitału i usług. Artykuł jednocześnie podkreśla, że wyjście Wielkiej Brytanii z Unii Europejskiej będzie miało istotny wpływ na zmianę funkcji tej granicy, która od tej chwili nie będzie już wewnętrzną, lecz zewnętrzną granicą Unii. Celem artykułu jest zatem analiza konsekwencji tej zmiany z równoczesnym wskazaniem różnych modeli funkcjonowania Wielkiej Br…
Appropriate technology in a Solovian nonlinear growth model
2007
We propose a Solovian growth model with a convex-concave production function and international technological spillovers. We test the empirical implications of the model, analysing the effects of the productivity slowdown that followed the oil shocks of the 1970s. We argue that this slowdown, altering the world income distribution, affected the pattern of international technological spillovers, taking the poorest countries further away from the technological leaders, and therefore unable to exploit their technologies. The result is the emergence of a poverty trap for low-income countries.
Savstarpējās saziņas funkcija Rīcības kodeksos
2018
Bakalaura darbs "Savstarpējas saziņas funkcija rīcības kodeksos" ir veltīta analīzei savstarpējas saziņas funkciju izmantošanai rīcības kodeksā četros Latvijas uzņēmumos. Šīs bakalaura darba mērķis ir analizēt savstarpēju saziņas funkciju rīcības kodeksā, lai identificētu rīcības kodeksā dominējošo savstarpējas saziņas funkciju veidu. Pētījuma metode ir literatūras aptauja un kvalitatīva analīze, kā arī savstarpējas saziņas funkcijas kvantitatīva analīze. Analīze tika veikta, lai palīdzētu labāk izprast tekstu. Šī pētījuma praktiskā daļa parādīja, ka savstarpējas saziņas funkcija ir neatņemama rīcības kodeksa sastāvdaļa. Frekvences analīze rāda, ka 1. personas vietniekvārdi ir biežāk sastop…