Publications de Li Chen | EPFL Graph Search

Colloidal transport and deposition through dense vegetation

David Andrew Barry, Li Chen, Congrong Yu

The effectiveness of submerged synthetic aquatic vegetation on removal of colloids from flowing water was investigated to explore retention of particulate nonpoint source pollutants in aquatic systems. In colloid transport experiments, the deposition rate ...

Elsevier2022

Investigating users' eye movement behavior in critiquing-based recommender systems

Pearl Pu Faltings, Li Chen, Feng Wang

Recommender systems have increasingly become popular in various web environments (such as e-commerce and social media) for automatically generating items that match to individual users' personal interests. Among different types of recommender systems that ...

Ios Press2017

Comparison of liquid hot water (LHW) and high boiling alcohol/water (HBAW) pretreatments for improving enzymatic saccharification of cellulose in bamboo

Li Chen, Li Shuai, Meng Li, Yubo Zhao, Jing Liu

Liquid hot water (LHW) and high-boiling point alcohol/water (HBAW) pretreatments were compared to improve enzymatic saccharification of cellulose in moso bamboo. When pretreatments were conducted at 200 degrees C for 40 min, HBAW (20% (v/v) 1,4- butanediol ...

Elsevier Science Bv2017

The Negligible Role of C-H Stretch Excitation in the Physisorption of CH4 on Pt(111)

Rainer Beck, Hirokazu Ueta, Li Chen, Helen Jane Chadwick

We report a molecular beam study of the effect of vibrational excitation on the physisorption of methane on a Pt(111) surface. Our experiments use a continuous molecular beam of CH4, prepared in its antisymmetic C-H stretch mode ν3 by infrared laser pumpin ...

American Chemical Society2015

State-Resolved Methane Dissociation on Pt(111) Studied by Reflection Absorption Infrared Spectroscopy

Rainer Beck, Hirokazu Ueta, Li Chen

The dissociation of methane on Pt(111) was studied using quantum state-resolved methods and reflection absorption infrared spectroscopy (RAIRS), at a surface temperature of 150 K where the nascent reaction products methyl(ads) and H(ads) are stable and acc ...

2015

Experiments on user experiences with recommender interfaces

Pearl Pu Faltings, Li Chen

Recommender systems have been increasingly adopted as personalisation services in e-commerce. They facilitate users to locate items which they would be interested in viewing or purchasing. However, most studies have emphasised on the algorithm's performanc ...

Taylor & Francis Ltd2014

Quantum state-resolved CH4 dissociation on Pt(111): coverage dependent barrier heights from experiment and density functional theory

Rainer Beck, Hirokazu Ueta, Li Chen

The dissociative chemisorption of CH4 on Pt(111) was studied using quantum state-resolved methods at a surface temperature (Ts) of 150 K where the nascent reaction products CH3(ads) and H(ads) are stable and accumulate on the surface. Most previous experim ...

Royal Society of Chemistry2013

Quantum state-resolved gas/surface reaction dynamics probed by reflection absorption infrared spectroscopy

Rainer Beck, Régis Bisson, Hirokazu Ueta, Li Chen

We report the design and characterization of a new molecular-beam/surface-science apparatus for quantum state-resolved studies of gas/surface reaction dynamics combining optical state-specific reactant preparation in a molecular beam by rapid adiabatic pas ...

American Institute of Physics2013

Multifaceted polymer coated, gold nanoparticles

Harm-Anton Klok, Li Chen

Gold nanoparticles modified with a two (or multi-) component polymer brush coating are an exciting class of nanomaterials. The presentation of two (or more) different polymer components can lead to truly multifaceted nanoparticles that can incorporate mult ...

Royal Soc Chemistry2013

Vibrationally Bond-Selective Chemisorption of Methane Isotopologues on Pt(111) Studied by Reflection Absorption Infrared Spectroscopy

Li Chen

In this thesis, I describe the design and first applications of a new molecular-beam/surface-science ultra-high vacuum apparatus. The new machine combines rovibrational state-selective infrared pumping of gas-phase reactants with reflection absorption infr ...

EPFL2012

Vibrationally bond-selected chemisorption of methane isotopologues on Pt(111) studied by reflection absorption infrared spectroscopy

Rainer Beck, Régis Bisson, Hirokazu Ueta, Li Chen

Reflection absorption infrared spectroscopy (RAIRS) was used to probe for vibrational bond-selectivity in the dissociative chemisorption of three partially deuterated methane isotopologues on a Pt(111) surface. While a combination of incident translational ...

Royal Society of Chemistry2012

Critiquing-based recommenders: survey and emerging trends

Pearl Pu Faltings, Li Chen

Critiquing-based recommender systems elicit users' feedback, called critiques, which they made on the recommended items. This conversational style of interaction is in contract to the standard model where users receive recommendations in a single interacti ...

2012

Evaluating recommender systems from the user's perspective: survey of the state of the art

Pearl Pu Faltings, Rong Hu, Li Chen

A recommender system is a Web technology that proactively suggests items of interest to users based on their objective behavior or explicitly stated preferences. Evaluations of recommender systems (RS) have traditionally focused on the performance of algor ...

Springer Netherlands2012

A User-Centric Evaluation Framework for Recommender Systems

Pearl Pu Faltings, Rong Hu, Li Chen

This research was motivated by our interest in understanding the criteria for measuring the success of a recommender system from users’ point view. Even though existing work has suggested a wide range of criteria, the consistency and validity of the combin ...

2011

Experiments on the Preference-Based Organization Interface in Recommender Systems

Pearl Pu Faltings, Li Chen

As e-commerce has evolved into its second generation, where the available products are becoming more complex and their abundance is almost unlimited, the task of locating a desired choice has become too difficult for the average user. Therefore, more effor ...

2010

Interaction design guidelines on critiquing-based recommender systems

Pearl Pu Faltings, Li Chen

A critiquing-based recommender system acts like an artificial salesperson. It engages users in a conversational dialog where users can provide feedback in the form of critiques to the sample items that were shown to them. The feedback, in turn, enables the ...

Springer Netherlands2009

How Users Perceive and Appraise Personalized Recommendations

Pearl Pu Faltings, Nicolas Jones, Li Chen

Traditional websites have long relied on users revealing their preferences explicitly through direct manipulation interfaces. However recent recommender systems have gone as far as using implicit feedback indicators to understand users' interests. More tha ...

Springer2009

User decision improvement and trust building in product recommender systems

Li Chen

As online stores are offering an almost unlimited shelf space, users must increasingly rely on product search and recommender systems to find their most preferred products and decide which item is the truly best one to buy. However, much research work has ...

EPFL2008

Evaluating product search and recommender systems for E-commerce environments

Pearl Pu Faltings, Pratyush Kumar, Li Chen

Online systems that help users select the most preferential item from a large electronic catalog are known as product search and recommender systems. Evaluation of various proposed technologies is essential for further development in this area. This paper ...

Springer US2008

A Cross-Cultural User Evaluation of Product Recommender Interfaces

Pearl Pu Faltings, Li Chen

We present a cross-cultural user evaluation of an organization-based product recommender interface, by comparing it with the traditional list view. The results show that it performed significantly better, for all study participants, in improving on their c ...

Acm Order Department, P O Box 64145, Baltimore, Md 21264 Usa2008