Human activities such as international trade and travel promote biological invasions by accidentally or deliberately dispersing species outside their native biogeographical ranges (Lockwood, 2005; Alpert, 2006). Invasive species are now viewed as a significant component of global change and have become a serious threat to natural communities (Mack et al., 2000; Pyšek & Richardson, 2010). The ec...

The testing of the null hypothesis of no treatment effect against the alternative of increasing treatment effect by means of rank statistics is extended from the classical Friedman random blocks model into an unbalanced design allowing treatments not to be applied simultaneously in each random block. The asymptotic normality of the constructed rank test statistic is proved both in the setting n...

This paper introduces the R package exuber for testing and date-stamping periods of mildly explosive dynamics (exuberance) in time series. The computes test statistics supremum augmented Dickey-Fuller (SADF) Phillips, Wu, Yu (2011), generalized SADF (GSADF) Shi, (2015a,b), panel GSADF proposed by Pavlidis, Yusupova, Paya, Peel, Martínez-García, Mack, Grossman (2016); generates finite-sample cri...

This study performs global stability/receptivity analyses of hypersonic sweep flows around a blunt body with an infinite span. For the first time, we obtain characteristics leading attachment-line mode to variation angles from 20 70 degrees. The eigenfunctions exhibit instability at edge. At same cross-flow (at small angles) or second Mack larger dominates further downstream. We establish adjoi...

We consider closed-loop control of a two-dimensional supersonic boundary layer at $M=4.5$ that aims reducing the linear growth second Mack mode instabilities. These instabilities are first characterized with local spatial and global resolvent analyses, which allow us to refine strategy select appropriate actuators sensors. After input–output reduced-order models have been identified, multi-crit...

International Journal of Social Science Studies (IJSSS) would like to acknowledge the following reviewers for their assistance with peer review manuscripts this issue. Many authors, regardless whether IJSSS publishes work, appreciate helpful feedback provided by reviewers. Their comments and suggestions were great help authors in improving quality papers. Each listed below returned at least one...

Abstract A piecewise acoustic metasurface is designed to suppress the first mode while marginally amplifying Mack second in a Mach 4 flat-plate boundary layer (BL) flow. The results of linear stability theory (LST) and e N method demonstrate stabilization effect transition delay performance, respectively. However, direct numerical simulation (DNS) indicate that broadband actually weakly excites...