An Exploration of Cross-border E-commerce Consumer Feedbacks: An LDA Approach

Cross-border e-commerce (CBEC) has become an important channel to help a firm to go into the international market in China. The recent influx in development of CEBC has caused a simultaneous influx in accumulation of text data such as consumer feedback. To better understand consumer feedback, we collected data from a leading CBEC firm in China to explore the topics of feedback posted directly by their customers. We employed the Latent Dirichlet Allocation (LDA) model to explore the potential topics focused on most by consumers. We found 35 primary topics are mentioned by both sellers and buyers. For the seller’s perspective, we found that the topics such as commission, product audit, communication between seller and buyer, order management and traffic are most important. On the buyer’s side, we found that return and refund, product tracking, product description, shipping time, and seller performance are the most mentioned topics. This study will help contribute to the understanding of how consumer feedback will help firms in many ways, including but not limited to recovering service and product failures, audit internal functions, and improve product quality

Searching for dark matter via mono-ZZ boson production at the ILC

High energy colliders provide a new unique way to determine the microscopic properties of the dark matter (DM). Weakly interacting massive particles (WIMPs) are widely considered as one of the best DM candidates. It is usually assumed that the WIMP couples to the SM sector through its interactions with quarks and leptons. In this paper, we investigate the DM pair production associated with a $Z$ boson in an effective field theory framework at the International Linear Collider (ILC), which can be used to study the interactions between the DM and leptons. For illustrative purposes, we present the integrated and differential cross sections for the $e^+ e^- \rightarrow \chi \bar{\chi} Z$ process, where the $Z$ boson is radiated from the initial state electron or positron. Meanwhile, we analyze the neutrino pair production in association with a $Z$ boson as the SM background.Comment: 12 pages, 5 figure

1-(4-Chloro­phen­yl)-1H-pyrazol-3-ol

In the title compound, C9H7ClN2O, the dihedral angle between the aromatic ring planes is 11.0 (2)°. In the crystal, inversion dimers linked by pairs of O—H⋯N hydrogen bonds generate R 2 2(8) loops

Engine fault feature extraction based on order tracking and VMD in transient conditions

A method based on order tracking and Variational Mode Decomposition was proposed to solve the problem of non-stationarity and background noise in the vibration signal of engine. For the vibration signal of diesel engine crankshaft bearing fault and Connecting rod bearing of gasoline engine, the non-stationary signal in the time domain was converted into a pseudo stationary signal on the angular domain based on order tracking. Then the reconstructed signal was decomposed by several components by VMD, and the component that contains fault information was selected. The three-dimensional spectral array of order, speed and power spectrum was calculated, and the fault feature was extracted. The effectiveness of the proposed method is verified by simulation and experiment

Thermoelectric Skutterudite Compositions and Methods for Producing the Same

Compositions related to skutterudite-based thermoelectric materials are disclosed. Such compositions can result in materials that have enhanced ZT values relative to one or more bulk materials from which the compositions are derived. Thermoelectric materials such as n-type and p-type skutterudites with high thermoelectric figures-of-merit can include materials with filler atoms and/or materials formed by compacting particles (e.g., nanoparticles) into a material with a plurality of grains each having a portion having a skutterudite-based structure. Methods of forming thermoelectric skutterudites, which can include the use of hot press processes to consolidate particles, are also disclosed. The particles to be consolidated can be derived from (e.g., grinded from), skutterudite-based bulk materials, elemental materials, other non-Skutterudite-based materials, or combinations of such materials

Quercetin inhibits porcine intestinal inflammation in vitro

Purpose: To investigate the effect of Quercetin (Que) on inflammatory reaction in intestinal porcine enterocyte cells, IPEC-J2, induced by lipopolysaccharide (LPS).Methods: IPEC-J2 cells were pretreated with Que and then incubated with LPS. Cell viability, cell morphology, nitric oxide (NO) content, gene expression levels of interleukin-6 (IL-6) and interleukin-8 (IL-8), were then evaluated.Results: LPS incubation at 10 μg/mL for 24 h showed no effect on the viability and cell morphology of IPEC-J2, while Que pre-incubation significantly enhanced the viability of IPEC-J2 and improved cell morphology (p < 0.05). Que decreased the expression levels of pro-inflammatory cytokines IL-6 mRNA and IL-8 mRNA raised by LPS (p < 0.05). Interestingly, both LPS and Que demonstrated no influence on the release of NO.Conclusion: Pre-treatment of Que shows a positive effect on intestinal porcine enterocyte cells and inhibited porcine intestinal inflammation in vitro induced by LPS, but the mechanism may be not associated with NO-related signaling pathway. Therefore, Que might have a potential effect as a veterinary drug or feed additive for the treatment of enteritis in pigs.Keywords: Quercetin, Inflammatory cytokines, Intestinal porcine enterocyte cells, Lipopolysaccharid