773,313 research outputs found
Real-Time Detection of Deoxyribonucleic Acid Bases via their Negative Differential Conductance Signature
In this paper we present a method for the real-time detection of the bases of
the deoxyribonucleic acid using their signatures in negative differential
conductance measurements. The present methods of electronic detection of
deoxyribonucleic acid bases are based on a statistical analysis because the
electrical currents of the four bases are weak and do not differ significantly
from one base to another. In contrast, we analyze a device that combines the
accumulated knowledge in nanopore and scanning tunneling detection, and which
is able to provide very distinctive electronic signatures for the four bases
Forbidden rectangles in compacta
We establish negative results about "rectangular" local bases in compacta.
For example, there is no compactum where all points have local bases of cofinal
type \omega x \omega_2. For another, the compactum \beta\omega has no
nontrivially rectangular local bases, and the same is consistently true of
\beta\omega \ \omega: no local base in \beta\omega has cofinal type \kappa x c
if \kappa < m_{\sigma-n-linked} for some n in [1,\omega). Also, CH implies that
every local base in \beta\omega \ \omega has the same cofinal type as one in
\beta\omega.
We also answer a question of Dobrinen and Todorcevic about cofinal types of
ultrafilters: the Fubini square of a filter on \omega always has the same
cofinal type as its Fubini cube. Moreover, the Fubini product of nonprincipal
P-filters on \omega is commutative modulo cofinal equivalence.Comment: 15 page
The migration policy of Armenia
The aim of this study is to describe the legal bases of the migration policy of Armenia and its practical implementation in 1995–2013. The author examined the international and national documents that provide the legal bases of Armenia’s migration policy, as well as the balance between departures and arrivals in the period 1995–2013, Armenian citizens’ reasons for emigrating and the occupations of emigrants. The study was based on the following research methods: content, system and quantitative analysis. The results of the analyses performed indicate that the objectives of Armenia’s migration policy were not completely fulfilled. Between 1995 and 2013, the number of emigrants declined, but Armenia’s overall migration balance was negative. The majority of those leaving the country went to Russia, followed by the other states of the CIS
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