Еще раз о формах показателя множественного числа в тюркских языках

Introduction. The article continues the discussion of isogloss types and their relevance for the Proto-Turkic reconstruction and reconstruction of the intermediate nodes of the Turkic family tree. Goals. The paper makes another attempt to reconstruct the morphophonological appearance of some affixes for intermediate languages-ancestors of the standard Turkic group (Oguz, ‘Kyrgyz’, Altai, Karluk, Toba, Kypchak). The study draws into consideration not only the plural affix *-lar, but in general inflectional and derivational affixes starting with *-l. Materials and Methods. Methods of stepwise reconstruction are used simultaneously with morphophonological methods of identifying classes of positions and distribution of classes of allomorphs. Field records of dialects, dialectological publications, both modern ones and those of the 19th century, as well as written monuments were used as research material. Results. Both modern field data and classical sources, with the correct application of the methods of stepwise reconstruction, point that affixal *-l has no alternants in proto-Oghuz, proto-Karluk and proto-Qypchaq. All instances of alternation in modern idioms like dialectal Bashkir, dialectal Kazakh, ‘Qyrghyz’ languages, Yakut-Dolghan and Toba languages are to be classified as recent areal innovation. This is deduced due to the nature of morphophonological rules in these languages — neither is applyable for the proto-Common-Turkic stem auslaut, but instead is limited to forms that are specific to each separate group in question.

Evaluation of the optimal image reconstruction interval for coronary artery imaging using 64-slice computed tomography

Background: Cardiac computed tomography (CT) has become an established complement in cardiac imaging. Thus, optimized image quality is diagnostically crucial. Purpose: To prospectively evaluate whether, by using 64-slice CT, a specific reconstruction interval can be identified providing best image quality for all coronary artery segments and each individual coronary artery. Material and Methods: 311 coronary segments of 14 men and seven women were analyzed using 64-slice CT. Data reconstruction was performed in 5% increments from 5–100% of the R–R interval. Four experienced observers independently evaluated image quality of the coronary arteries according to the AHA classification. A three-point ranking scale was applied: 1, very poor, no evaluation possible; 2, diagnostically sufficient quality; 3, highest image quality, no artifacts. Results: The best reconstruction point for all segments was found to be 65% of the R–R interval (mean value 2.4±0.5; P<0.05). On a per-artery basis, best image quality was again achieved at 65% of the R–R interval: RCA 2.2±0.4, LCA 2.4±0.5, LM 2.5±0.2, LAD 2.3±0.4, LCX 2.3±0.5. Conclusion: By using 64-slice CT, the need for adjusting the reconstruction point to each coronary segment might be overcome. Best image quality was achieved with image reconstruction at 65% of the R–R interval for all coronary segments as well as each coronary artery.

Summer temperature trend over the past two millennia using air content in Himalayan ice

Two Himalayan ice cores display a factor-two decreasing trend of air content over the past two millennia, in contrast to the relatively stable values in Greenland and Antarctica ice cores over the same period. Because the air content can be related with the relative frequency and intensity of melt phenomena, its variations along the Himalayan ice cores provide an indication of summer temperature trend. Our reconstruction point toward an unprecedented warming trend in the 20th century but does not depict the usual trends associated with "Medieval Warm Period" (MWP), or "Little Ice Age" (LIA).

Summer temperature trend over the past two millennia using air content in Himalayan ice

Two Himalayan ice cores display a factor-two decreasing trend of air content over the past two millennia, in contrast to the relatively stable values in Greenland and Antarctica ice cores over the same period. Because the air content can be related with the relative frequency and intensity of melt phenomena, its variations along the Himalayan ice cores provide an indication of summer temperature trend. Our reconstruction point toward an unprecedented warming trend in the 20th century but does not depict the usual trends associated with "Medieval Warm Period" (MWP), or "Little Ice Age" (LIA).

Enhancement of Reconstruction Accuracy of the HELS Method

The validity of the HELS method (Wu, 2000) for reconstructing the acoustic pressure field inside the minimum circle that encloses an arbitrary object is examined. Results show that the HELS solutions are approximate and the corresponding matrix equation is ill conditioned in general for back propagation of the acoustic field. Accordingly, the further the reconstruction point moves inside the minimum circle, the worse the reconstruction accuracy becomes. To overcome this difficulty new strategy for sensor placement is proposed. This strategy together with a constrained minimization are shown to yield satisfactory reconstruction inside the minimum circle. The same procedures can be extended to three-dimensional problems.