Global potential energy surface and product pair-correlated distributions for the F(2P) + SiH4 reaction. Comparison with experiments.

In this paper we study the gas-phase hydrogen abstraction reaction between fluorine atoms and silane in a three-step process: potential energy surface, kinetics and dynamics. Firstly, we developed for the...

PSEUDO-MULTIVARIATE LSTM NEURAL NETWORK APPROACH FOR PURCHASE DAY PREDICTION IN B2B

This research focuses on trying to predict the moment of the next purchase for a customer in vendor-customer B2B scenario using an LSTM neural network and comparing prediction results from different input features. In a previous research we performed predictions for a specific customer product pair and used previous purchases for that pair as input data, but the number of such previous purchases was often very limited which resulted in low accuracy of predictions. By aggregating purchase data for all products a customer purchased, we were able to get more precise predictions of the next purchase. Additionally, expanding our input feature set yielded even better results. We performed an evaluation of LSTM networks trained with the most successful combination of input features for a six month period. Each of the networks was trained with purchase data up to the starting point of the selected period and the predictions were performed, after which additional input for the following seven days was added to the network. This process was then repeated for the entire six month period and a slight downward trend can be noticed for error metrics, leading to the conclusion that the network would perform even better over time with the addition of future purchases.

Theoretical study of the Cl(2P) + SiH4 reaction: Global potential energy surface and product pair-correlated distributions. Comparison with experiment.

For the theoretical study of the title reaction, an analytical full-dimensional potential energy surface named PES-2021 was developed for the first time, by fitting high-level explicitly-correlated ab initio data. This...

Effects of Advertising on Food Consumption Preferences in Children

(1) Background: Childhood obesity is a public health problem. The purpose of this study was to know if exposure to commercial messages which advertise food products exerts any effect on the short-term consumption preferences of 4- to 6-year-old children. (2) Methods: A double-blind and randomized experimental design. Sample consisted of 421 boys and girls from twelve schools in a city in Spain. (3) Results: In three of the four product pairs shown, the products advertised in the intervention were preferred. In the results of applying the model for the first product pair presented, sugared cereals, the predictive variable which best explains the behavior of the preferences expressed is gender (Odds Ratio 0.285 (0.19–0.42); p < 0.05). For the second pair, chocolate cookies, the family’s nationality has a strong weight in the model. As regards the regression model calculated for the last pair (filled rolls), the predictive variable which showed having more influence was gender. Boys had a 1.39 times higher risk of selecting the advertised product than girls. (4) Conclusions: The persuasive effect of commercials has shown to be influential in a general, immediate, and significant way only in the case of products with wide brand awareness. This study reinforces the importance of advertising and emphasizes the need to initiate measures to control the content of TV commercials.

The end of the Multi Fiber Arrangement and the pattern of US apparel trade

PurposeThis paper analyzes the effects of the expiration of the Multi Fiber Arrangement (MFA), which ended quota restrictions on US textile and apparel imports in 2005, on the sourcing of US apparel. We test if the realignment in trade following the phase out of quotas can be explained by comparative advantage and market size.Design/methodology/approachWe use a gravity framework to investigate the role of comparative advantage (labor costs) and other factors such as exporter size, PTAs and tariff reductions on the pattern of US apparel imports. Detailed data on quotas by country-product pair are used for the purpose.FindingsOur empirical results show a significant increase in imports from large quota constrained countries once the MFA ended. Moreover, the pattern of trade seems to favor low wage countries that have a comparative advantage in producing apparel, which is highly labor intensive.Originality/valueThe end of quotas removed a major distorting factor in US apparel trade. This study examines the role of trade theory in the changing pattern of apparel imports that followed the end of the MFA. We use a gravity framework to test the theory of comparative advantage and the role of exporter size. Previous studies on the end of the MFA and its effects, do not examine the causal factors behind the realignment of US apparel trade.

Real-time tracking of the entangled pathways in the multichannel photodissociation of acetaldehyde

Unraveling the entangled multi-channel dissociation pathways by a two-dimensional, time and product pair-correlation, measurement and ab initio calculations.

Imaging pair-correlated reaction cross sections in F + CH3D(νb = 0, 1) → CH2D(ν4 = 1) + HF(ν)

Product pair-correlated distributions in the title reactions are revealed by imaging the state-tagged CH2D(ν4 = 1) products.

Direct observation of product-pair correlations in rotationally inelastic collisions of ND3 with D2

Rotational product-pair correlations have been observed, while ND3 was rotationally excited, D2 was simultaneously rotationally excited and de-excited.