Publications associées à Empirical formula

Quantifying the Solution Structure of Metal Nanoclusters Using Small-Angle Neutron Scattering

Francesco Stellacci, Stefan Guldin, Zhi Luo, Ye Yang, Huayan Yang

Metal nanoclusters are a unique class of synthetic material, as their crystal structures can be resolved using X-ray diffraction, and their chemical formula can be precisely determinated from mass spectroscopy. However, a complete structure characterizatio ...

Wiley-VCH Verlag GmbH2022

Improved Natural-Air-Convection-Cooling Formulas for Medium Frequency Transformer Design Optimization

Drazen Dujic, Marko Mogorovic, Jonas Piet K Le Roy

This paper provides accurate analytic models for a computationally efficient estimation of the natural con- vection cooling coefficients for typical geometries, such as those encountered in transformers. Proper thermal coordination is an essential step of ...

2021

Heterogeneous nucleation of water vapor on different types of black carbon particles

Athanasios Nenes

The heterogeneous nucleation of water vapor on insoluble particles affects cloud formation, precipitation, the hydrological cycle, and climate. Despite its importance, heterogeneous nucleation remains a poorly understood phenomenon that relies heavily on e ...

Copernicus GmbH2020

Discovery of a self-healing catalyst for the hydrolytic dehydrogenation of ammonia borane

Emad Oveisi, Mounir Driss Mensi, Fatmah Ebrahim, Kyriakos Stylianou, Ngoc Tú Nguyên, Andrzej Gladysiak, Bardiya Valizadeh, Fatma Pelin Uran

Sustainable catalysts based on earth-abundant elements are considered as economical alternatives to precious-metal-bearing catalysts and could be impactful for many applications. Self-healing sustainable catalysts, which in addition to their 'green' charac ...

Royal Society of Chemistry2019

From experimental evidence to mechanical modeling and design expressions: The Critical Shear Crack Theory for shear design

Aurelio Muttoni, Miguel Fernández Ruiz

Many research efforts have so far been devoted to the topic of shear design of members without transverse reinforcement since the first development in structural concrete. This has allowed a number of significant advances in the understanding of the phenom ...

2019

Photoanode/Electrolyte Interface Stability in Aqueous Dye-Sensitized Solar Cells

Michael Graetzel, Guido Viscardi

O'Regan and Gratzel conceived a dye-sensitized solar cell (DSSC), which operates as an artificial photosynthetic system converting solar light into electricity. Nevertheless, it is only recently that the scientific community is focusing on truly aqueous DS ...

Wiley-V C H Verlag Gmbh2017

Characterization of hydraulic behavior of orifices in conduits

Nicolas Jean François Pascal Ghislain Adam

High-head power plants are the main pillar of Swiss peak electricity production. With the 2050 Energy Strategy approved by Swiss voters, the annual production of hydroelectricity should increase by 4%, while 90% of the technically feasible potential is alr ...

EPFL2017

An Inner-Product Calculus for Periodic Functions and Curves

Michaël Unser, Daniel Andreas Schmitter, Anaïs Laure Marie-Thérèse Badoual

Our motivation is the design of efficient algorithms to process closed curves represented by basis functions or wavelets. To that end, we introduce an inner-product calculus to evaluate correlations and

L _{ 2 }

distances between such curves. In partic ...

IEEE Institute of Electrical and Electronics Engineers2016

Influence of geometry shape factor on trapping and flushing efficiencies

Anton Schleiss, Sameh Ahmad Kantoush

The trap efficiency of a shallow reservoir depends on the characteristics of the inflowing sediments and the retention time of the water in the reservoir, which in turn are controlled by the reservoir geometry. With the purpose of controlling the trapped a ...

CRC Press/Balkema2014

Punching shear design in MC2010: incorporating new knowledge and grounding design expressions on physical models

Aurelio Muttoni, Miguel Fernández Ruiz

Model Code 2010 (MC2010) has presented a deep review on punching shear design with respect to previous versions of Model Code (1978, 1990). These changes have been motivated by the fact that MC2010 is grounded on a physical theory rather than on empirical ...

fib Symposium Tel-Aviv 20132013

Ag-44(SR)(30)(4-): a silver-thiolate superatom complex

Francesco Stellacci, Kellen Michael Harkness

Intensely and broadly absorbing nanoparticles (IBANs) of silver protected by arylthiolates were recently synthesized and showed unique optical properties, yet question of their dispersity and their molecular formulas remained. Here IBANs are identified as ...

2012

Influence of geometric, strain and size effects on bond in structural concrete

Aurelio Muttoni, Miguel Fernández Ruiz

Design formulations for calculation of bond strength in structural concrete members usually include a number of parameters such as the stress acting in the reinforcement, the concrete cover and the diameter of the reinforcing bars. These parameters are act ...

Bond in Concrete 20122012

An application of Evolutionary Optimization Algorithms for Determining Concentration and Velocity Profiles in Sheet flows and Overlying Layers

David Andrew Barry, Roham Bakhtyar

The Particle Swarm Optimization (PSO) method and the Genetic Algorithm (GA) were used to derive formulas for determining the velocity and concentration profiles in sheet flows. Specifically, these evolutionary optimization algorithms were used in conjuncti ...

Asme-Amer Soc Mechanical Eng2012

La teoría de la fisura crítica como base teórica para el diseño de losas frente a punzonamiento en el nuevo Código Modelo 2010 (The Critical Shear Crack Theory as a physical model for punching shear design and its implementation into new Model Code 2010)

Aurelio Muttoni, Miguel Fernández Ruiz, Juan Sagaseta Albajar

On April 2010, the first complete draft of new Model Code 2010 was published. It introduced a number of innovative design approaches, some of them with respect to shear and punching shear. Contrary to Model Code 90 (or some national and international codes ...

Hormigón y Acero2012

Photopatterning of Synthetic Hydrogels

Katarzyna Mosiewicz

In recent years sophisticated biomaterials have made a significant impact on our understanding of cellular behavior, particularly in the fields of stem cell research and tissue engineering. Nevertheless, the promising potential of stem cells for regenerati ...

EPFL2012

New provisions for punching shear in Model Code 2010 based on the Critical Shear Crack Theory

Aurelio Muttoni, Miguel Fernández Ruiz, Juan Sagaseta Albajar, Luca Tassinari

The provisions for punching shear around concentrated loads in the new Model Code 2010 (MC2010) have been updated, covering a large number of design cases such as slabs with and without transverse reinforcement, different column/slab geometries and prestre ...

fib Symposium Prague 20112011

Analysis of Ultralow-Power Asynchronous ADCs

Christian Enz, Aravind Prasad Heragu Singaiyengar

In this paper, analysis of a novel class of A/D converters based on asynchronous delta modulation (DM) is presented and a high level model is realized for the same. Using the high level model, analytical expressions are derived for the calculation of the i ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2010

Solution of the tunneling-percolation problem in the nanocomposite regime

Peter Ryser, Claudio Grimaldi, Thomas Maeder, Gianluca Ambrosetti

We noted that the tunneling-percolation framework is quite well understood at the extreme cases of percolation-like and hopping-like behaviors but that the intermediate regime has not been previously discussed, in spite of its relevance to the intensively ...

2010

Reactive transport in unsaturated Soil: Comprehensive modelling of the dynamic spatial and temporal mass balance of water and chemical components

David Andrew Barry, Laurin Wissmeier

By implementing the moisture-based form of Richards' equation into the geochemical modelling framework PHREEQC, a generic tool for the simulation of one-dimensional flow and solute transport in the vadose zone undergoing complex geochemical reactions was d ...

2008

Influence of macro-roughness of walls on steady and unsteady flow in a channel

Tobias Meile

High-head storage hydropower plants mainly operate their turbines during periods of high energy demand. The sudden starting and stopping of turbines (hydropeaking) lead to highly unsteady flow in channels and rivers. Besides hydropeaking, other anthropogen ...

EPFL2007