Armenian National Academy of Sciences

About: Armenian National Academy of Sciences is a government organization based out in Yerevan, Armenia. It is known for research contribution in the topics: Population & Laser. The organization has 4090 authors who have published 4042 publications receiving 40828 citations. The organization is also known as: Armenian National Academy of Sciences & NAS RA.

Enhanced electric field sensitivity of rf-dressed Rydberg dark states

Abstract: The formation of rf-dressed Rydberg dark states in thermal Rb vapour is demonstrated. It is shown that such states exhibit enhanced sensitivity to dc electric fields compared to their bare counterparts and enable precise measurement of the dc field independent of laser frequency fluctuations.

New paramagnetic peculiarity of the superconductive transition detected by a highly sensitive OFC magnetometer

Abstract: The improved `LC-resonator' technique (the open-flat coil magnetometer), based on a low-power stable-frequency tunnel diode oscillator with a single-layer open-faced coil, is very sensitive to changes of position. About 1 A absolute and better than 10-6 relative resolution can be reached in distance change measurements. It is an excellent MHz-range scientific instrument with which one may study weakly expressed fine peculiarities of the superconductive state in small-volume thin plate-like high-Tc superconductors (HTS). It enables changes to be detected of about 1 pH of the HTS film's magnetic inductance (changes of ~1-3 A of the magnetic penetration depth, λ) with very high (~10-6) relative resolution. Owing to the pick-up coil's flat design, relatively low operation frequency and high relative resolution, the present method has advantages over others. It is essential for non-destructive studies of thin flat HTS materials (with a small signal) especially near Tc (at the beginning of the formation of `Cooper' pairs). Mainly as the result of these advantages a new `paramagnetic' peculiarity of the superconductive transition has been detected in Y-Ba-Cu-O film, which precedes the well known `diamagnetic' ejection. A possible explanation of the observed effect is given, and the influence of some external physical parameters on the effect is revealed and discussed.

Bioactive Molecules of Herbal Extracts with Anti-Infective and Wound Healing Properties

Abstract: Medicinal plants are priceless sources of bioactive compounds, and despite the contemporary progresses in pharmaceuticals and drug developments they remain a major source of medicine for a large proportion of our world. Novel antibacterial quinolone compounds derived from Evodia rutaecarpa against Helico bacterpylori, plant-based anticancer agents including vincristine, vinblastine, irinotecan, novel maloyl glucans derived from Aloe vera having wound healing effects, and the antimutagenic agent 4-hydroxypanduratin A isolated from fresh rhizomes of Boesenbergia pandurata are a few examples of the thousands of valuable discoveries in this area of science which help us to maintain our lives in this world. This chapter focuses on presenting some medicinal plants with wound healing and anti-infective properties.

Almost everywhere strong summability of Marcinkiewicz means of double Walsh-Fourier series

Abstract: In this paper we study the a.e. strong convergence of the quadratical partial sums of the two-dimensional Walsh-Fourier series. In particular, we prove the a.e. relation \(\left( {\tfrac{1}{n}\sum olimits_{m = 0}^{n - 1} {\left| {S_{mm} f - f} \right|^q } } \right)^{1/q} \to 0\) for every two-dimensional functions belonging to L log L and q > 0. From the theorem of Getsadze [7] it follows that the space L log L cannot be enlarged with preserving this strong summability property.

Museum automation with RFID

Abstract: By increase of culture and knowledge of the people, request for visiting museums has increased and made the management of these places more complex.