Jan Vávra
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View article: Evolving voices based on temporal Poisson factorisation
Evolving voices based on temporal Poisson factorisation Open
The world is evolving and so is the vocabulary used to discuss topics in speech. Analysing political speech data from more than 30 years requires the use of flexible topic models to uncover the latent topics and their change in prevalence …
View article: Seeded Poisson Factorization: leveraging domain knowledge to fit topic models
Seeded Poisson Factorization: leveraging domain knowledge to fit topic models Open
Topic models are widely used for discovering latent thematic structures in large text corpora, yet traditional unsupervised methods often struggle to align with pre-defined conceptual domains. This paper introduces seeded Poisson Factoriza…
View article: Do green fingers munch on more fruit and veggies? Health effects of home gardening
Do green fingers munch on more fruit and veggies? Health effects of home gardening Open
Inadequate consumption of fresh fruits and vegetables is a persistent problem in many highly urbanized Global North countries. The research suggests that the intake of fresh fruits and vegetables is influenced by households’ food productio…
View article: Evolving Voices Based on Temporal Poisson Factorisation
Evolving Voices Based on Temporal Poisson Factorisation Open
The world is evolving and so is the vocabulary used to discuss topics in speech. Analysing political speech data from more than 30 years requires the use of flexible topic models to uncover the latent topics and their change in prevalence …
View article: A Structural Text-Based Scaling Model for Analyzing Political Discourse
A Structural Text-Based Scaling Model for Analyzing Political Discourse Open
Scaling political actors based on their individual characteristics and behavior helps profiling and grouping them as well as understanding changes in the political landscape. In this paper we introduce the Structural Text-Based Scaling (ST…
View article: An insight into market and non-market alternative food networks in Czechia during Covid-19 and beyond
An insight into market and non-market alternative food networks in Czechia during Covid-19 and beyond Open
Introduction The Covid-19 pandemic affected food systems in many countries and emphasized a lot of already existing social, economic and environmental agri-food problems. Alternative food networks (AFNs), praised for their ability to impro…
View article: The effectiveness of resistance exercises performed on stable and unstable surfaces in relation to torso activation
The effectiveness of resistance exercises performed on stable and unstable surfaces in relation to torso activation Open
Introduction: Deep stabilization system (DSS) strength and endurance are crucial for injury prevention and athletic performance. Training surfaces can influence training outcomes; therefore, this study aimed to compare the impact of perfor…
View article: Data from: Cu+ transient species mediate Cu catalyst reconstruction during CO2 electroreduction
Data from: Cu+ transient species mediate Cu catalyst reconstruction during CO2 electroreduction Open
Understanding metal surface reconstruction is of the uttermost importance in heterogeneous catalysis as this phenomenon directly affects the nature of available active sites. However, surface reconstruction is notoriously difficult to stud…
View article: Data from: Cu+ transient species mediate Cu catalyst reconstruction during CO2 electroreduction
Data from: Cu+ transient species mediate Cu catalyst reconstruction during CO2 electroreduction Open
Understanding metal surface reconstruction is of the uttermost importance in heterogeneous catalysis as this phenomenon directly affects the nature of available active sites. However, surface reconstruction is notoriously difficult to stud…
View article: Data from: Cu+ transient species mediate Cu catalyst reconstruction during CO2 electroreduction
Data from: Cu+ transient species mediate Cu catalyst reconstruction during CO2 electroreduction Open
Understanding metal surface reconstruction is of the uttermost importance in heterogeneous catalysis as this phenomenon directly affects the nature of available active sites. However, surface reconstruction is notoriously difficult to stud…
View article: Socioeconomic and health predictors for food insecurity during the COVID-19 pandemic in Czechia
Socioeconomic and health predictors for food insecurity during the COVID-19 pandemic in Czechia Open
Background COVID-19 impacted people disproportionately and exacerbated preexisting social and health inequalities. The aim of this study was to understand how socioeconomic and health conditions affected food security in Czechia during the…
View article: Cu+ transient species mediate Cu catalyst reconstruction during CO2 electroreduction
Cu+ transient species mediate Cu catalyst reconstruction during CO2 electroreduction Open
Understanding metal surface reconstruction during operation is of the uttermost importance in heterogeneous catalysis as it directly affects the available active sites. However, surface reconstruction is notoriously difficult to study beca…
View article: Energy literacy in Czechia and its influence on citizens’ perception of energy consumption behaviour
Energy literacy in Czechia and its influence on citizens’ perception of energy consumption behaviour Open
The analysis is based on a sample of 1015 citizens from Czechia. The cognitive energy literacy index (CELI), based on the knowledge of the energy mix in electricity production and the knowledge of the import/export of electricity in Czechi…
View article: Considerations of Liquid-Phase Transmission Electron Microscopy Applied to Heterogeneous Electrocatalysis
Considerations of Liquid-Phase Transmission Electron Microscopy Applied to Heterogeneous Electrocatalysis Open
Liquid-phase transmission electron microscopy (LPTEM) is an essential tool for studying the dynamics of materials interactions at the nanoscale, in and/or with their operational environment. Microfabricated SiN x membrane cells further all…
View article: Local Action Groups and Sustainable Development Agenda: Case Study of Regional Perspectives From Czechia
Local Action Groups and Sustainable Development Agenda: Case Study of Regional Perspectives From Czechia Open
The United Nations' 2030 Agenda for Sustainable Development is generally accepted as an overarching framework to cope with various global challenges. Many of them are manifested locally and need to be solved at the regional or local level.…
View article: Role of Actors in the Processes of Sustainable Development at Local Level—Experiences From the Czech Republic
Role of Actors in the Processes of Sustainable Development at Local Level—Experiences From the Czech Republic Open
In this text we are interested in the preconditions for, and opportunities provided by sustainable development at local level in non-metropolitan areas, i. e., in rural areas and villages. These areas are generally seen as having an import…
View article: Copper-Phosphonate Lamella Intermediates Control the Shape of Colloidal Copper Nanocrystals
Copper-Phosphonate Lamella Intermediates Control the Shape of Colloidal Copper Nanocrystals Open
Understanding the structure and behavior of intermediates in chemical reactions is key to developing greater control over the reaction outcome. This principle is particularly important in the synthesis of metal nanocrystals (NC), where the…
View article: Copper Phosphonate Lamella Intermediates Control the Shape of Colloidal Copper Nanocrystals
Copper Phosphonate Lamella Intermediates Control the Shape of Colloidal Copper Nanocrystals Open
Understanding the structure and behavior of intermediates in chemical reactions is the key to developing greater control over the reaction outcome. This principle is particularly important in the synthesis of metal nanocrystals (NCs), wher…
View article: From coping strategy to hopeful everyday practice: Changing interpretations of food self‐provisioning
From coping strategy to hopeful everyday practice: Changing interpretations of food self‐provisioning Open
While alternative food networks (AFNs) have become the leading conceptualisation of sustainable food systems, vibrant scholarship on food self‐provisioning (FSP) in Central and Eastern Europe has remained confined to the geopolitical regio…
View article: Data from: Cu+ transient species mediate Cu catalyst reconstruction during CO2 electroreduction
Data from: Cu+ transient species mediate Cu catalyst reconstruction during CO2 electroreduction Open
Understanding metal surface reconstruction during operation is of the uttermost importance in heterogeneous catalysis as it directly affects the available active sites. However, surface reconstruction is notoriously difficult to study beca…
View article: The Native Oxide Skin of Liquid Metal Ga Nanoparticles Prevents Their Rapid Coalescence during Electrocatalysis
The Native Oxide Skin of Liquid Metal Ga Nanoparticles Prevents Their Rapid Coalescence during Electrocatalysis Open
Liquid metals (LMs) have been used in electrochemistry since the 19th century, but it is only recently that they have emerged as electrocatalysts with unique properties, such as inherent resistance to coke poisoning, which derives from the…
View article: European Food Systems in a Regional Perspective: A Comparative Study of the Effect of COVID-19 on Households and City-Region Food Systems
European Food Systems in a Regional Perspective: A Comparative Study of the Effect of COVID-19 on Households and City-Region Food Systems Open
The concept of the city-region food system is gaining attention due to the need to improve food availability, quality and environmental benefits, for example through sustainable agri-food strategies. The COVID-19 pandemic has reinforced th…
View article: Cu+ transient species mediate Cu catalyst reconstruction during CO2 electroreduction
Cu+ transient species mediate Cu catalyst reconstruction during CO2 electroreduction Open
Understanding metal surface reconstruction during operation is of the uttermost importance in heterogeneous catalysis as it directly affects the available active sites. However, surface reconstruction is notoriously difficult to study beca…
View article: Metastable Brominated Nanodiamond Surface Enables Room Temperature and Catalysis-Free Amine Chemistry
Metastable Brominated Nanodiamond Surface Enables Room Temperature and Catalysis-Free Amine Chemistry Open
Bromination of high-pressure, high-temperature (HPHT) nanodiamond (ND) surfaces has not been explored and can open new avenues for increased chemical reactivity and diamond lattice covalent bond formation. The large bond dissociation energ…
View article: A metastable brominated nanodiamond surface enables room temperature and catalysis-free amine chemistry
A metastable brominated nanodiamond surface enables room temperature and catalysis-free amine chemistry Open
Bromination of high-pressure high-temperature (HPHT) nanodiamond (ND) surfaces has not been explored and can open new avenues for increased chemical reactivity and diamond lattice covalent bond formation. The large bond dissociation energy…
View article: Electron probing of the oxygen evolving Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3-δ</sub>
Electron probing of the oxygen evolving Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3-δ</sub> Open
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View article: Introduction to the Special Issue “A Systemic Perspective on Urban Food Supply: Assessing Different Types of Urban Agriculture”
Introduction to the Special Issue “A Systemic Perspective on Urban Food Supply: Assessing Different Types of Urban Agriculture” Open
The production of food within cities through urban agriculture can be considered as a nature-based solution and is argued to be an important response to the current COVID-19 pandemic as well as to climate change and other urban challenges.…
View article: Synthetic Tunability of Colloidal Covalent Organic Framework/Nanocrystal Hybrids
Synthetic Tunability of Colloidal Covalent Organic Framework/Nanocrystal Hybrids Open
The combination of porous reticular frameworks and nanocrystals (NCs) offers a rich playground to design materials with functionalities, which are beneficial for a large variety of applications. Achieving compositional and structural tunab…