Types of Grammatical Errors in the Essays Written by Fourth-semester Students of English Department, Petra Christian University

This study deals with errors which include tenses (verb forms), number agreement, and active-passive voice, word order, and word formation on students' essays.The purpose of this study is to find out the types of errors committed by the students in Written 4 class based on five categories which are addition, omission, misformation, misordering and blends. The writer found that the most frequent error is misformation, especially the misformation of verbs and nouns. In conclusion, the students committed misformation, misordering, addition, omission, and blends errors; and misformation is the most commonly committed error which is found in their essays

Inviscid helical magnetorotational instability in cylindrical Taylor-Couette flow

This paper presents the analysis of axisymmetric helical magnetorotational instability (HMRI) in the inviscid limit, which is relevant for astrophysical conditions. The inductionless approximation defined by zero magnetic Prandtl number is adopted to distinguish the HMRI from the standard MRI in the cylindrical Taylor-Couette flow subject to a helical magnetic field. Using a Chebyshev collocation method convective and absolute instability thresholds are computed in terms of the Elsasser number for a fixed ratio of inner and outer radii \lambda=2 and various ratios of rotation rates and helicities of the magnetic field. It is found that the extension of self-sustained HMRI modes beyond the Rayleigh limit does not reach the astrophysically relevant Keplerian rotation profile not only in the narrow- but also in the finite-gap approximation. The Keppler limit can be attained only by the convective HMRI mode provided that the boundaries are perfectly conducting. However, this mode requires not only a permanent external excitation to be observable but also has a long axial wave length, which is not compatible with limited thickness of astrophysical accretion disks.Comment: 12 pages, 9 figures, published version with a few typos correcte

The white dwarf in dwarf nova SDSS J080434.20+510349.2: Entering the instability strip?

SDSS J080434.20+510349.2 is the WZ type binary that displayed rare outburst in 2006 (Pavlenko et al., 2007). During the long-lasting tail of the late stage of the outburst binary shown the two-humped or four-humped profile of the orbital light modulation. The amplitude of orbital light curve decreased while the mean brightness decreased, more over that occurred $\sim$ 10 times faster during the fast outburst decline in respect to the late quiet state of slow outburst fading. There were no white dwarf pulsations detected neither 1 - 1.5 months prior to the outburst nor in 1.5 - 2 months after the 2006 outburst in this system. However the strong non-radial pulsations with period 12.6 minutes and mean amplitude of 0.05^m were first detected in V band with 2.6-m Shajn mirror telescope of the Crimean astrophysical observatory in ~ 8 months after the outburst. The evolution of pulsations over two years in 2006 - 2008 is considered. It is supposed that pulsations first appeared when the cooling white dwarf (after the outburst) entered the instability strip although the possibility of temporary lack of pulsations at some occasions also could not be excluded.Comment: Submitted to Proceedings of 16th European White Dwarf Workshop (EUROWD08

This is What it Means to be a DACA Recipient

Since 2012, over 800,000 DREAMers, like ourselves, have been given the legal right to work, apply for a driver’s license, and, most importantly, live without the fear of deportation. We complete background checks and pay $495 in fees every two years to maintain our DACA (Deferred Action for Childhood Arrivals) status. [excerpt

Light and stable triplet bipolarons on square and triangular lattices

We compute the properties of singlet and triplet bipolarons on two-dimensional lattices using the continuous time quantum Monte Carlo algorithm. Properties of the bipolaron including the total energy, inverse mass, bipolaron radius and number of phonons associated with the bipolaron demonstrate the qualitative difference between models of electron phonon interaction with long-range interaction (screened Fr\"ohlich) and those with purely local (Holstein) interaction. A major result of our survey of the parameter space is the existence of extra-light hybrid singlet bipolarons consisting of an on-site and an off-site component on both square and triangular lattices. We also compute triplet properties of the bipolarons and the pair dispersion. For pair momenta on the edge of the Brillouin zone of the triangular lattice, we find that triplet states are more stable than singlets

BANKS CONSOLIDATION IN NIGERIA: A SYNERGISTIC HARVEST

In order to strengthen the competitive and operational capabilities of banks in Nigeria with a view towards returning global and public confidence to the Nigerian banking sector and the economy in general, the Central Bank of Nigeria instituted a banking reform which saw most of the then existing 89 banks merging with each other. It was earlier speculated in some financial analysis quarters that the exercise might turn out to be one of those overblown hypes of an ailing economy. This, however, has turned out to be the opposite as most post-merger results tend to highlight that financial synergies exist. This paper tries to evaluate the authenticity of this assertion. To do this, pre-merger and post merger financial statements of 4 consolidated banks were obtained, adjusted, carefully analyzed and compared. The result revealed that all the four merger groups produced in addition to operational and relational synergy, financial gains far more than the 2+2=5 synergistic effects. The validating two-way ANOVA test also revealed that variations in shareholders funds can significantly affect the value of total assets of a bank