ABSTRACT Background Although evidence suggests that dental floss contains perfluoroalkyl and polyfluoroalkyl substances (PFASs), it is still uncertain whether the use of contributes to an increased risk PFAS exposure. Methods We analysed data on serum concentrations usage in a cohort 6750 adults who participated National Health Nutrition Examination Survey (NHANES) from 2009 2020. In our study, we used logistic regression, survey‐weighted linear model, item response theory (IRT) scores,...

Abstract Library service to international students is a challenge because many are not fluent in English or have any previous library experience American universities. database interfaces, suchs as EBSCO, OCLC's FirstSearch, Cambridge Scientific Abstracts (CSA), and JSTOR provide additional language features (in Spanish, French, Chinese, Japanese, Korean) assist students. Librarians at Central Missouri State University St. Louis conducted survey find out the preferences of Topics include use...

The vehicle routing problem (VRP) has a wide range of applications in the field logistics distribution. In order to reduce cost distribution, distance-constrained and capacitated VRP with split deliveries by (DCVRPSDO) was studied. We show that customer demand, which can't be classical model, can only discrete order. A model double objective programming is constructed taking minimum number vehicles used traveling as first second objective, respectively. This approach contains series...

In order to promote the development of low-carbon logistics and economize distribution costs, vehicle routing problem with split deliveries by backpack is studied. With help model classical capacitated problem, in this study, a form discrete was designed which customer demand can be only backpack. A double-objective mathematical corresponding adaptive tabu search (TS) algorithm were constructed for solving problem. By embedding penalty mechanism, adopting random neighborhood selection...

In this paper, by taking the outsourcing transportation mode into account, a bilevel programming model is proposed to formulate static bike repositioning (SBR) problem, which can be used determine number of bikes loaded and unloaded at each station optimal truck routes in sharing systems (BSS). The upper-level BSS providers loading unloading quantities stations minimize total penalties. lower-level owner pursues minimum route cost. An iterated local search tabu are developed solve model....

A new approach for determining the forest leaf area index (LAI) from a geometric-optical model inversion using multisensor observations is developed. For improving LAI estimate forested on rugged terrain, priori information tree height and spectra of four scene components mutual shadowing (GOMS) are extracted airborne light-detection ranging (LiDAR) data optical remote sensing with high spatial resolution, respectively. The slope aspect study derived digital elevation data. These parameters...

Abstract The James C. Kirkpatrick Library at Central Missouri State University launched a chat reference service in 2002. To analyze the effectiveness of this service, transcripts 100 sessions were examined. ALA's RUSA Guidelines for Behavioral Performance Reference and Information Service Providers used as an evaluation tool. Our analysis has provided insights into current state our how it can be improved. also demonstrated that when are conducted effectively, user leaves session with...

Ecosystem health assessment is an important part of improving the management national parks. In this paper, Shennongjia National Park taken as study region. By using satellite remote sensing data from 2000 to 2018, based on Vitality Organization Resilience (VOR) model, ecosystem created and its spatiotemporal characteristics are analyzed. whole region, ecosystem’s level has gradually improved; rate improvement 2016 2018 been 2.5-times that overall trend obvious. The non-nature protection...

With China's economy constantly developing, more international students are going to China study and research. We, the researchers from United States China, interested in students' perspectives of using Chinese academic libraries. A survey was conducted at Wuhan Beijing universities obtain feedback on their experiences with library services. Information collected a five-point Likert Scale questionnaire focusing areas general services, policies, collections, electronic access, environment....

In this paper, a clonal selection algorithm for the open vehicle routing problem (OVRP) is presented, in which new definition of antibodies' affinity and keeping diversity are introduced. Computational results on set benchmark problems provided. Comparison with best ones literature shows that efficient.