4,237 research outputs found
Calibration Methods of Laser-Induced Breakdown Spectroscopy
Laser-induced breakdown spectroscopy (LIBS) has gained great attention over the past two decades due to its many advantages, such as needless sample preparation, capability of remote measurement and fast multielement simultaneous analysis. However, because of its inherent uncertainty features of plasma, it is still a big challenge for LIBS community worldwide to realize high sensitivity and accurate quantitative analysis. Currently, many chemometric analytical methods have been applied to LIBS calibration analysis, including univariate regression, multivariate regression, principal component regression (PCR), partial least squares regression (PLSR) and so on. In addition, appropriate sample and spectral pretreatment can effectively improve the analytical performance (i.e., limit of detection (LOD), accuracy and repeatability) of LIBS. In this chapter, we briefly summarize the progress of these calibration methods and their applications on LIBS and provide our recommendations
Research on Factors Affecting the Use of E-commerce Consumer Credit Services: A Study of Ant Check Later
This study uses “Ant Check Later”, the e-commerce consumer credit service of Alibaba, as the artifact and explores factors affecting its use. This study first summarized initiatives that Alibaba has launched to stimulate the use of “Ant Check Later”. Three factors, bonus, quota lifting, and scenario enrichment, were then distinguished from the initiatives using principal component analysis. These factors were anticipated to affect consumers’ intention to use the service. The research model was tested using 373 respondents collected from an online survey. Results indicate that bonus, quota lifting, and scenario enrichment are three predictors of consumers’ intention to continue using the service, and bonus and scenario enrichment positively affect non-users’ intention to use the service. This study found that scenario enrichment is the most important factor among the three factors in boosting consumers’ behavioral intention toward using the service. Keywords E-commerce consumer credit services, bonus, quota lifting, scenario enrichment, acceptance
Unitary Constraints on Semiclassical Schwarzschild Black Holes in the Presence of Island
We reconsider dimensional asymptotically flat eternal Schwarzschild
black hole, and focus on the situation where the inner boundary of the
radiation region is chosen to be near the horizon (i.e. ). The
tension between the near horizon condition and the short-distance approximation
emerges in large dimensions in previous papers. We remove this tension by
introducing a more proper near horizon condition, thus the resulting island
solution is well-behaved in any dimensional spacetime. Interestingly,
a novel constraint is obtained in this situation as required by the existence
of the island solution, which directly leads to the constraints on the size of
the Schwarzschild black hole, the position of the inner boundary for the
radiation region, or the value of in any
dimension. When considering the large limit, the constraint on the size of
the Schwarzschild black hole obtained in this situation is in agreement with
the result given in . We interpret these as
the unitary constraints implied by the presence of island in semiclassical
gravity.Comment: 21 pages, 4 figures; new contents added in Section 3.2 to derive the
constraint, also many related modification
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