Results 21 to 30 of about 319,246 (248)

Tendência, ciclos e sazonalidade nos preços spot do café brasileiro na NYBOT Trend, cycles and seasonality in spot prices of brazilian coffee at the NYBOT

open access: yesGestão & Produção, 2007
Pretendeu-se com este trabalho de pesquisa detectar a existência dos componentes estocásticos e/ou determinísticos de tendência, ciclo, e sazonalidade nos preços do mercado spot da principal commodity agrícola do Brasil: o café.
Wagner Moura Lamounier
doaj   +1 more source

Development of Accuracy for the Weighted Fuzzy Time Series Forecasting Model Using Lagrange Quadratic Programming

open access: yesJTAM (Jurnal Teori dan Aplikasi Matematika), 2023
Limitation within the WFTS model, which relies on midpoints within intervals and linguistic variable relationships for assigning weights. This reliance can result in reduced accuracy, especially when dealing with extreme values during trend to ...
Agus Fachrur Rozy   +2 more
doaj   +1 more source

Generalized seasonal autoregressive integrated moving average models for count data with application to malaria time series with low case numbers. [PDF]

open access: yesPLoS ONE, 2013
INTRODUCTION: With the renewed drive towards malaria elimination, there is a need for improved surveillance tools. While time series analysis is an important tool for surveillance, prediction and for measuring interventions' impact, approximations by ...
Olivier J T Briët   +2 more
doaj   +1 more source

Statistical Downscaling of Seasonal Forecasts of Sea Level Anomalies for U.S. Coasts

open access: yesGeophysical Research Letters, 2023
Increasing coastal inundation risk in a warming climate will require accurate and reliable seasonal forecasts of sea level anomalies at fine spatial scales.
Xiaoyu Long   +2 more
doaj   +1 more source

Comparative assessment of macroinvertebrate communities within three Afromontane headwater streams influenced by different land use patterns

open access: yesEcological Indicators, 2021
Headwater streams in Afromontane ecoregions harbour locally adapted aquatic communities. However, across many regions in Africa, these ecosystems and their unique aquatic biodiversity have been severely impacted by unsustainable land use practices.
Nonjabulo H. Matomela   +2 more
doaj   +1 more source

Optimizing COVID-19 vaccine distribution across the United States using deterministic and stochastic recurrent neural networks.

open access: yesPLoS ONE, 2021
Optimizing COVID-19 vaccine distribution can help plan around the limited production and distribution of vaccination, particularly in early stages. One of the main criteria for equitable vaccine distribution is predicting the geographic distribution of ...
Mohammad Reza Davahli   +2 more
doaj   +1 more source

Smart Exploration of Perovskite Photovoltaics: From AI Driven Discovery to Autonomous Laboratories

open access: yesAdvanced Energy Materials, EarlyView.
In this review, we summarize the fundamentals of AI in automated materials science, and review AI applications in perovskite solar cells. Then, we sum up recent progress in AI‐guided manufacturing optimization, and highlight AI‐driven high‐throughput and autonomous laboratories.
Wenning Chen   +4 more
wiley   +1 more source

A Spectral Analysis-Driven SARIMAX Framework with Fourier Terms for Monthly Dust Concentration Forecasting

open access: yesEarth
This study aimed to forecast monthly PM2.5 concentrations in Zabol, one of the world’s most dust-prone regions, using four time series models: SARIMA, SARIMAX enhanced with Fourier terms (selected based on spectral peak analysis), TBATS, and a novel ...
Ommolbanin Bazrafshan   +3 more
doaj   +1 more source

Integrating Perennial Groundcover in Corn and Soybean Acres: Impacts on U.S. Agriculture

open access: yesApplied Economic Perspectives and Policy, EarlyView.
ABSTRACT Sustainable agricultural practices such as cover cropping can improve soil health, water quality, and carbon sequestration, yet U.S. adoption remains limited due to economic and operational barriers. We evaluate market and economic impacts of integrating perennial groundcover into U.S.
Sagar Dahal, Amani Elobeid, John Crespi
wiley   +1 more source

Estimating a novel stochastic model for within-field disease dynamics of banana bunchy top virus via approximate Bayesian computation.

open access: yesPLoS Computational Biology, 2020
The Banana Bunchy Top Virus (BBTV) is one of the most economically important vector-borne banana diseases throughout the Asia-Pacific Basin and presents a significant challenge to the agricultural sector. Current models of BBTV are largely deterministic,
Abhishek Varghese   +3 more
doaj   +1 more source

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