353 research outputs found
Analysis of Supply Factors of the Migrant Workers Based on Comprehensive Fuzzy Evaluation
The factors affecting the supply of the migrant workers are very complex, which is difficult to use a specific number to demonstrate due to factors such as different groups of people, different time and different degrees of effect. This paper adopts the comprehensive fuzzy evaluation method to simulate the main factors affecting the supply of migrant workers including income, cost, expectancy, having a quantitative analysis of their influence on the labor supply of migrant workers. Key words: Comprehensive fuzzy evaluation; Migrant workers; Supply; Factors analysis Résumé: Les facteurs affectant la fourniture des travailleurs migrants sont très complexes, ce qui est difficile à utiliser c’est de démonter un nombre spécifique en raison de facteurs tels que les différents groupes de personnes, de temps différents et les différents degrés d'effet. Ce document adopte la méthode d'évaluation globale floue pour simuler les principaux facteurs affectant l'offre de travailleurs migrants dont le revenu, le coût, l'espérance, ayant une analyse quantitative de leur influence sur l'offre de travail des travailleurs migrants Mots-clés: L’évaluation floue complète; Les travailleurs migrants; L’approvisionnement; L'analyse des facteur
Study on Distortional Buckling of Cold-Formed Stainless Steel Beams
In the current research, distortional buckling of cold-formed stainless steel open-section beams was investigated. Four-point bending tests of eight C-section stainless steel beams, made of S30401 alloy, were carried out with global and local buckling precluded by careful design of specimen and test rigs. A detailed finite element model based on ABAQUS was developed and verified against test data. Parametric study was carried out with the verified model, covering four types of sections (C, Z, SupaCee, and SupaZed), three stainless steel alloys (S30401, S44330, S32101), and a series of section slenderness. A convenient method to identify distortional buckling point in either experimental or numerical study was discussed. Existing design formula for stainless steel and steel structure were assessed with the available data. Revised formula based on Direct Strength Method was proposed
A Preliminary Study on Stainless Steel Hollow Flange Beams Featuring Lateral-Distortional Buckling
To explore the potential of using stainless steel structurally, extensive research has been carried out to study the structural behavior of stainless steel member as associated with the nonlinear stress-strain relationship. Hollow flange sections feature improved structural efficiency and a unique issue of web distortion. Steel hollow flange sections have been studied and commercially distributed (e.g. the very first HFB section and lately LSB section). As a proactive study, this paper investigates stainless steel hollow flange beams of double-symmetric section with numerical modeling and parametric analysis. The validity of the idealized FE model was verified with existing study on steel counterparts. Specifically, three alloys (S30401, S44330, S32101) and a series of sections and membe
Accurate Reconstruction of Molecular Phylogenies for Proteins Using Codon and Amino Acid Unified Sequence Alignments (CAUSA)
Based on molecular clock hypothesis, and neutral theory of molecular evolution, molecular phylogenies have been widely used for inferring evolutionary history of organisms and individual genes. Traditionally, alignments and phylogeny trees of proteins and their coding DNA sequences are constructed separately, thus often different conclusions were drawn. Here we present a new strategy for sequence alignment and phylogenetic tree reconstruction, codon and amino acid unified sequence alignment (CAUSA), which aligns DNA and protein sequences and draw phylogenetic trees in a unified manner. We demonstrated that CAUSA improves both the accuracy of multiple sequence alignments and phylogenetic trees by solving a variety of molecular evolutionary problems in virus, bacteria and mammals. Our results support the hypothesis that the molecular clock for proteins has two pointers existing separately in DNA and protein sequences. It is more accurate to read the molecular clock by combination (additive) of these two pointers, since the ticking rates of them are sometimes consistent, sometimes different. CAUSA software were released as Open Source under GNU/GPL license, and are downloadable free of charge from the website www.dnapluspro.com
Collision-induced Hopf-type bifurcation reversible transitions in a dual-wavelength femtosecond fiber laser
Collision refers to a striking nonlinear interaction in dissipative systems,
revealing the particle-like properties of solitons. In dual-wavelength
mode-locked fiber lasers, collisions are inherent and periodic. However, how
collisions influence the dynamical transitions in the dual-wavelength
mode-locked state has still not been explored. In our research, dispersion
management triggers the complex interactions between solitons in the cavity. We
reveal the smooth or reversible Hopf-type bifurcation transitions of dual-color
soliton molecules (SMs) during collision by real-time spectral measurement
technique of TS-DFT. The reversible transitions from stationary SM to vibrating
SM, revealing that cavity parameters pass through a bifurcation point in the
collision process without active external intervention. The numerical results
confirm the universality of collision-induced bifurcation behavior. These
findings provide new insights into collision dynamics in dual-wavelength
ultrafast fiber lasers. Furthermore, the study of intermolecular collisions is
of great significance for other branches of nonlinear science.Comment: 11 pages, 4 figure
Patient Dropout Prediction in Virtual Health: A Multimodal Dynamic Knowledge Graph and Text Mining Approach
Virtual health has been acclaimed as a transformative force in healthcare
delivery. Yet, its dropout issue is critical that leads to poor health
outcomes, increased health, societal, and economic costs. Timely prediction of
patient dropout enables stakeholders to take proactive steps to address
patients' concerns, potentially improving retention rates. In virtual health,
the information asymmetries inherent in its delivery format, between different
stakeholders, and across different healthcare delivery systems hinder the
performance of existing predictive methods. To resolve those information
asymmetries, we propose a Multimodal Dynamic Knowledge-driven Dropout
Prediction (MDKDP) framework that learns implicit and explicit knowledge from
doctor-patient dialogues and the dynamic and complex networks of various
stakeholders in both online and offline healthcare delivery systems. We
evaluate MDKDP by partnering with one of the largest virtual health platforms
in China. MDKDP improves the F1-score by 3.26 percentage points relative to the
best benchmark. Comprehensive robustness analyses show that integrating
stakeholder attributes, knowledge dynamics, and compact bilinear pooling
significantly improves the performance. Our work provides significant
implications for healthcare IT by revealing the value of mining relations and
knowledge across different service modalities. Practically, MDKDP offers a
novel design artifact for virtual health platforms in patient dropout
management
1-(4,5,6,7-Tetrahydrothieno[3,2-c]pyridin-5-yl)-2-{4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}ethanone
In the title molecule, C20H22F3N3OS, the piperazine ring has a chair conformation, and the N—C(=O)—C—N torsion angle is −59.42 (14)°. In the crystal, weak C—H⋯O and C—H⋯π interactions link the molecules into layers parallel to (101)
Study on Section Capacity of Stainless Steel Lipped-C Beam-Columns
This paper aims to explore the buckling behavior and the section capacity of cold-formed stainless steel lipped-C stub beam-columns under combined axial compression and uniaxial bending. A total of 24 stub columns were tested comprising two sets of sections designed to fail by distortional buckling mode and local buckling mode respectively. Two alloys, austenitic S30401 and duplex S32205, were employed in the experiments. Three loading eccentricity levels (none, small and large) were designed to produce different stress gradients within the tested sections. Refined finite element models were established with ABAQUS and validated with the detailed test results. A systematic geometric and material nonlinear analysis were then carried out covering two alloys, four plate thicknesses, four local/distortional buckling slenderness levels and five loading eccentricity levels. Lastly, based on the current Direct Strength Method (DSM) design expression, the modified expression for the section capacity prediction was proposed which suits both stainless steel columns and beam-columns of lipped-C sections
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