14,563 research outputs found
The Impact of Intra-Transaction Communication on Customer Purchase Behaviour in E-Commerce Context
Online shopping has progressed from having customers passively browse through product pages to having them proactively engage in communication dialogs with product sellers via Live-Chat. Customers indicated that communication with seller is an important type of salesperson service, which begins from their information search and ends with their purchase decision. Building on Content and Style (C&S) framework, this study seeks to understand how the intra-transaction communication influences the customersâ purchase behaviour in environment of e-commerce. By collecting 1234 communication sessions and their following purchase orders from 85 customers, we have a preliminary test of the proposed conceptual hypotheses, and results indicated that informativeness, conversation topic, and emotional expression had significant positive impact on the likelihood of customersâ purchase. This study presents a theoretical-driven and empirically validated proposition to improve the intra-communication to aid customersâ online shopping
Three Moving Groups Detected in the LAMOST DR1 Archive
We analyze the kinematics of thick disk and halo stars observed by the Large Sky Area Multi-Object Fiber Spectroscopic Telescope. We have constructed a sample of 7993 F, G, and K nearby main-sequence stars (d \u3c 2 kpc) with estimates of position (x, y, z) and space velocity (U, V, W) based on color and proper motion from the Sloan Digital Sky Survey DR9 catalog. Three âphase-space overdensitiesâ are identified in (V,âU2 + 2V 2) with significance levels of Ï \u3e 3. Two of them (the HyadesâPleiades stream and the ArcturusâAF06 stream) have been identified previously. We also find evidence for a new stream (centered at V ⌠â180 km sâ1) in the halo. The formation mechanisms of these three streams are analyzed. Our results support the hypothesis that the ArcturusâAF06 stream and the new stream originated from the debris of a disrupted satellite, while the HyadesâPleiades stream has a dynamical origin
Co-constructing the assessment criteria for EFL writing by instructors and students: A participative approach to constructively aligning the CEFR, curricula, teaching and learning
The current assessment in language classrooms prevailingly utilizes the criteria provided by instructors, regarding learners as passive recipients of assessment. The current study drew upon sustainable assessment and the community of practice to highlight the importance of involving learners in co-constructing the assessment criteria and argued that using the criteria provided by instructors could lead to discrepancy between assessment, teaching, and learning. It adopted a participatory approach and investigated how to involve learners in co-constructing the assessment criteria with instructors in tertiary English writing instruction in China, based on the European Language Profile (ELP), an evolved version of the Common European Framework of Reference for Languages (CEFR). Two writing instructors and 146 tertiary students played different, yet interactive roles in adapting the assessment criteria in the local context. Instructors drafted the criteria in line with curricula, teaching, learning and learners. Learners utilized the draft criteria in a training session and suggested possible modifications to the criteria in a survey. Suggestions were used to revise the descriptors alongside teachersâ reflections via reflective logs. A follow-up survey explored studentsâ perceptions of the feasibility and usefulness of the modified descriptors to investigate the effectiveness of co-constructing the assessment criteria for learning and reveal further improvement if necessary. Vigilant decision-making processes were thickly described regarding how assessment descriptors were selected, arranged, and modified to constructively align them with curricula, teaching, and learning. Statistical and thematic analyses were conducted to examine the accessibility, feasibility, and usefulness of the assessment descriptors prior to and after the modifications. Results substantiated the effectiveness and thus the importance of co-constructing assessment criteria for enhancing the quality of assessment criteria and developing learnersâ cognitive and metacognitive knowledge of writing and assessment. Implications for language tutors regarding co-constructing assessment criteria in local contexts were deliberated on at the end of the article
Systematic NLTE study of the -2.6 < [Fe/H] < 0.2 F and G dwarfs in the solar neighbourhood. I. Stellar atmosphere parameters
We present atmospheric parameters for 51 nearby FG dwarfs uniformly
distributed over the -2.60 < [Fe/H] < +0.20 metallicity range that is suitable
for the Galactic chemical evolution research. Lines of iron, Fe I and Fe II,
were used to derive a homogeneous set of effective temperatures, surface
gravities, iron abundances, and microturbulence velocities. We used
high-resolution (R>60000) Shane/Hamilton and CFHT/ESPaDOnS observed spectra and
non-local thermodynamic equilibrium (NLTE) line formation for Fe I and Fe II in
the classical 1D model atmospheres. The spectroscopic method was tested with
the 20 benchmark stars, for which there are multiple measurements of the
infrared flux method (IRFM) Teff and their Hipparcos parallax error is < 10%.
We found NLTE abundances from lines of Fe I and Fe II to be consistent within
0.06 dex for every benchmark star, when applying a scaling factor of S_H = 0.5
to the Drawinian rates of inelastic Fe+H collisions. The obtained atmospheric
parameters were checked for each program star by comparing its position in the
log g-Teff plane with the theoretical evolutionary track in the Yi et al.
(2004) grid. Our final effective temperatures lie in between the T_IRFM scales
of Alonso et al. (1996) and Casagrande et al. (2011), with a mean difference of
+46 K and -51 K, respectively. NLTE leads to higher surface gravity compared
with that for LTE. The shift in log g is smaller than 0.1 dex for stars with
either [Fe/H] > -0.75, or Teff 4.20. NLTE analysis is
crucial for the VMP turn-off and subgiant stars, for which the shift in log g
between NLTE and LTE can be up to 0.5 dex. The obtained atmospheric parameters
will be used in the forthcoming papers to determine NLTE abundances of
important astrophysical elements from lithium to europium and to improve
observational constraints on the chemo-dynamical models of the Galaxy
evolution.Comment: 18 pages, 14 figures, accepted for publication in Ap
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